: A satellite system consists of 4 components and can operate adequately if at least 2 of the 4 components are functional. If each component is, independently, functional with probability 0.6, what is the probability that the system operates adequately

Answers

Answer 1

The probability that the satellite system operates adequately is 0.7056.

The probability that a component is not functional is 0.4. Therefore, the probability that a component is functional is 1-0.4=0.6.
Using the rule of combinations, there are 6 possible combinations of functional and non-functional components:
1. All 4 components are functional: (0.6)^4=0.1296
2. 3 components are functional: (0.6)^3(0.4)=0.3456
3. 2 components are functional: (0.6)^2(0.4)^2=0.2304
4. 1 component is functional: (0.6)(0.4)^3=0.0256
5. No components are functional: (0.4)^4=0.0256
6. At least 2 components are functional: P(2 or 3 or 4) = 0.1296 + 0.3456 + 0.2304 = 0.7056
Therefore, the probability that the satellite system operates adequately is 0.7056.

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Related Questions

The volume of a square pyramid is equal to _____ times the volume of a cube where the bases are the same, but the square pyramid is half the height of the cube. A. B. C. D. Please select the best answer from the choices provided A B C D

Answers

The volume of a square pyramid is equal to 1/6 times the volume of a cube when the bases are the same, and the square pyramid is half the height of the cube. The best answer is A.

The volume of a square pyramid can be found using the formula V = (1/3)Bh, where V represents the volume, B is the area of the base, and h is the height of the pyramid. For a cube, the volume formula is V = s^3, where s is the length of a side.

In this scenario, the bases of the square pyramid and the cube are the same, which means that the area of the base (B) and the length of a side (s) of the cube are equal. Additionally, the square pyramid has half the height of the cube. Let's denote the height of the pyramid as h and the height of the cube as 2h.

Now, let's compare their volumes:

Volume of the square pyramid = (1/3)Bh
Volume of the cube = s^3 = B * 2h (since B = s^2)

To find the relationship between their volumes, divide the volume of the square pyramid by the volume of the cube:

(Volume of the square pyramid) / (Volume of the cube) = ((1/3)Bh) / (B * 2h)

Simplify this equation:

(1/3) / 2 = 1/6

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If the average weight for women is normally distributed with a mean of 135 pounds and a standard deviation of 15 pounds, then approxi- mately 68% of all women should weigh between and pounds. a. 120; 150 b. 120; 135 c. 105; 165 d. Cannot say from the information given

Answers

This is because of the empirical rule, which states that for a normal distribution, approximately 68% of the data falls within one standard deviation of the mean. The answer is option B: 120; 135.

In this case, one standard deviation above the mean is 150 pounds (135 + 15) and one standard deviation below the mean is 120 pounds (135 - 15). Therefore, approximately 68% of all women should weigh between 120 and 150 pounds.
If the average weight for women is normally distributed with a mean of 135 pounds and a standard deviation of 15 pounds, then approximately 68% of all women should weigh between:

1. Calculate the lower limit: mean - standard deviation = 135 - 15 = 120 pounds
2. Calculate the upper limit: mean + standard deviation = 135 + 15 = 150 pounds

So, approximately 68% of all women should weigh between 120 and 150 pounds. The correct answer is option a. 120; 150.

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A pedestrian starts walking from town A to town B. At the same time, another pedestrian starts walking from town B to town A. They pass each other at noon and continue on their paths. One of them arrives at 4 PM, the other at 9 PM. How many hours had each walked before passing each other

Answers

The pedestrian who started in town A walked for 8 hours before the noon meeting, and the pedestrian who started in town B walked for 6 hours before the noon meeting.

Let's call the distance between town A and town B "D".

When the two pedestrians meet at noon, they have together covered a distance of D, which means they each have walked half the distance, or D/2.

Let's say the pedestrian who started in town A arrives at 4 PM, which means they have walked for 4 hours after the noon meeting. We can use the formula distance = rate x time, where rate is the pedestrian's speed, to find how far they have walked before the noon meeting:

distance = rate x time

D/2 = rate x (noon - 4)

D/2 = rate x (-4)

D/2 = -4rate

rate = -D/8

The negative sign indicates that this pedestrian is walking from town A to town B, in the opposite direction from the positive direction we defined earlier. The magnitude of the rate is D/8, meaning this pedestrian covers 1/8th of the distance every hour.

Similarly, we can use the same formula for the pedestrian who started in town B and arrived at 9 PM:

distance = rate x time

D/2 = rate x (9 - noon)

D/2 = rate x 3

D/6 = rate

rate = D/18

This pedestrian is walking from town B to town A, in the positive direction we defined earlier. The magnitude of the rate is D/18, meaning this pedestrian covers 1/18th of the distance every hour.

Now we can calculate how long each pedestrian walked before the noon meeting:

time = distance / rate

For the pedestrian who arrived in town A at 4 PM:

time = D/2 / (-D/8) = -4 hours

For the pedestrian who arrived in town B at 9 PM:

time = D/2 / (D/18) = 9 hours

The negative sign for the pedestrian who arrived in town A indicates that they started walking in the wrong direction, so they actually walked for 4 - (-4) = 8 hours in the correct direction before reaching the noon meeting point. The pedestrian who arrived in town B walked for 9 - 3 = 6 hours in the correct direction before the noon meeting.

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If we took an SRS of 1700 people from California (population 34 million) and an SRS of 1000 people from Detroit (population 1 million) which sampling distribution would have the smaller standard deviation

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Therefore,  SE1/SE2 is less than 1, we can conclude that the sampling distribution for the SRS from California (1700 people) would have a smaller standard deviation compared to the SRS from Detroit (1000 people).

The sampling distribution for the SRS of 1000 people from Detroit would have a smaller standard deviation because the population size is smaller. As population size increases, the standard deviation of the sampling distribution decreases, so the larger population of California (34 million) would result in a larger standard deviation for the sampling distribution of the SRS of 1700 people.

we need to compare the standard errors of the two simple random samples (SRS) from California and Detroit.
Standard Error (SE) is calculated as follows:
SE = σ / √n
where σ is the population standard deviation and n is the sample size.

1. For California:
Sample size (n1) = 1700
Population size (N1) = 34 million

2. For Detroit:
Sample size (n2) = 1000
Population size (N2) = 1 million
Now, let's compare the SE for both:
SE1/SE2 = (σ1/√n1) / (σ2/√n2)


Without knowing the population standard deviations (σ1 and σ2), we cannot determine the exact standard errors. However, since both samples are taken from human populations, it's reasonable to assume that the population standard deviations are relatively similar.
Therefore, we can focus on the sample sizes to compare the standard errors:
SE1/SE2 ≈ (√n2) / (√n1)
SE1/SE2 ≈ (√1000) / (√1700)
SE1/SE2 ≈ (31.62) / (41.23)
SE1/SE2 ≈ 0.77

Therefore,  SE1/SE2 is less than 1, we can conclude that the sampling distribution for the SRS from California (1700 people) would have a smaller standard deviation compared to the SRS from Detroit (1000 people).

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The piecewise function shown is made up of a quadratic function and a linear
function.
What is the domain of the piecewise function?

Answers

This domain may be rewritten as:

[tex][tex]-3\le x\le4\, and\, 4[/tex]

Thus, option C is correct.

How to solve

In the graph, we can see the domain by looking at the x values in which the function is defined.

As we can see, the left part of the graph starts at point (-3, 9) and it is filled so it includes it. So, the domain "starts" at x = -3, values below it are undefined on the function.

The quadratic part ends at point (4, 16), so at x = 4 and including it. However, the linear part starts at (4, -1), excluding the point, so at the exact point one ends, the other starts, and no x value is left out on the the transition from one part to the other.

Then, the linear part is defined until point (9, -3.xxx). We don't know exactly the value of the y coordinate, bu the x = 9 is enough for use to know that the function is only defined until x = 9, including it.

Putting these together, we see that the function is defined between the x values of -3 and 9, including both, so the domain is:

[tex][tex]-3\le x\le9\,[/tex]

As the proper alternative divided this interval into the quadratic and linear sections, we don't have an accurate alternative.

So, this domain may be rewritten as:

[tex][tex]-3\le x\le4\, and\, 4[/tex]

Thus, option C is correct.

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Consider the following triangle.
A
с
13
B
12
2016 StrongMind. Created using GeoGebra
IM
C
Based on the given information, what is the measure of the missing length, c?
Enter your answer as a number like this: 42

Answers

The missing side of the right triangle is 5

Missing length of the right triangle

Right triangles are described as having a right angle that is 90 degrees. The hypotenuse, or side facing the right angle, is the longest side. The other two sides of a right triangle are its legs.

Using the Pythagorean theorem;

According to the theorem that I have just mentioned above, we can write for the right triangle that;

[tex]c^2 = a^2 + b^2[/tex]

Then in the particular case that we have in this problem;

[tex]c = \sqrt{} 13^2 - 12^2[/tex]

c = 5

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Find the probability or percent of the event described.Of the coffee makers sold in an appliance store, 6.0% have either a faulty switch or a defective cord, 1.5% have a faulty switch, and 0.5% have both defects. What percent of the coffee makers will have a defective cord

Answers

In terms of probability, we can say that the probability of selecting a coffee maker with a defective cord is 5.0% or 0.05. The percentage of coffee makers with a defective cord.


To find the probability of a coffee maker having a defective cord, we'll use the given information about faulty switches and defective cords.

We know that:
1. 6.0% of coffee makers have either a faulty switch or a defective cord.
2. 1.5% have a faulty switch.
3. 0.5% have both defects.

Using the formula for the probability of the union of two events (A or B) - P(A ∪ B) = P(A) + P(B) - P(A ∩ B), where A represents the event of a faulty switch, B represents the event of a defective cord, and A ∩ B represents both defects:

P(A ∪ B) = 6.0% (either a faulty switch or a defective cord)
P(A) = 1.5% (faulty switch)
P(A ∩ B) = 0.5% (both defects)

We need to find P(B), the probability of a coffee maker having a defective cord.

Using the formula, we can write:
6.0% = 1.5% + P(B) - 0.5%

Now, we'll solve for P(B):
6.0% = 1.0% + P(B)
P(B) = 6.0% - 1.0%
P(B) = 5.0%

Therefore, the probability (percent) of a coffee maker having a defective cord is 5.0%.

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I want 5 halves of a cupcake for myself, 6 halves for my friends, and 3 halves for our other friend

Answers

Answer: If the question is how many halves will you need in total, then the answer is 14 halves in total or 7 wholes      

Step-by-step explanation:

Answer:

That's a total of 7 cupcakes.

Step-by-step explanation:

5 halves is 2 1/2.

6 halves is 3.

3 halves is 1 1/2.

2 + 3 + 1 + (1/2 + 1/2)

2 + 3 + 1 + (1)

2 + 3 + 1 + 1

5 + 1 + 1

6 + 1

7

An airplane manufacturer buys rivets to use in constructing airplanes. It is important that the mean shearing strength is not lower than 725 lbs. From the latest shipment of rivets, a random sample of 50 rivets is selected. This sample of rivets has a mean shearing strength of 720 lbs. and a standard deviation of 20 lbs. Does this data provide evidence at the 0.10 level of significance that the mean shearing strength is below 725? Give the null and alternative hypotheses.

Answers

The null hypothesis is that the mean shearing strength of the rivets is equal to or greater than 725 lbs. The alternative hypothesis is that the mean shearing strength is less than 725 lbs. There is evidence at the 0.10 level of significance

Using a one-tailed test with a significance level of 0.10, we can determine if the sample data provides evidence to reject the null hypothesis in favor of the alternative.

The null hypothesis can be stated as H₀: µ ≥ 725, and the alternative hypothesis can be stated as H₁: µ < 725.

To test this hypothesis, we can use a t-test with a t-statistic of:

t = ([tex]\bar{X}[/tex] - µ₀) / (s / √n)

Where [tex]\bar{X}[/tex] is the sample mean, µ₀ is the null hypothesis mean (725 lbs.), s is the sample standard deviation, and n is the sample size.

Plugging in the given values, we get:

t = (720 - 725) / (20 / √50) = -1.77

Using 49 degrees of freedom (n-1), at a significance level of 0.10 and a one-tailed test, the critical t-value is -1.645. Since our calculated t-value (-1.77) is less than the critical t-value, we can reject the null hypothesis in favor of the alternative.

This means that there is evidence at the 0.10 level of significance that the mean shearing strength of the rivets is below 725 lbs.

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many diuretic drugs reduce the reabsorption of na and water in the kidneys. as a result,

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Many diuretic drugs reduce the reabsorption of sodium and water in the kidneys. As a result, the volume of urine produced by the kidneys increases, leading to decreased fluid retention and reduced blood pressure.

This is because the excess sodium and water in the body are excreted through urine, causing the blood volume to decrease, and blood vessels to dilate, resulting in lower blood pressure. However, it is important to note that diuretic drugs can also cause side effects such as electrolyte imbalances, dehydration, and increased urination frequency. It is crucial to follow the prescribed dosage and consult a healthcare professional before taking diuretic drugs.

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Can someone help me with this as soon as possible

Answers

The area of the right triangle that is given would be = 60.

How to calculate the area of a triangle?

To calculate the area of the given triangle, the base of the triangle should first be calculated using the Pythagorean theorem.

That is ;

C² = a²+b²

c = 17

a = 8

b = ?

make b the subject of formula;

b² = c²-a²

= 17²-8²

= 289-64

= 225

b = √225 = 15

The area = ½ base ×height

= 1/2× 15 × 8

= 60

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3.In match play, after the hole has begun, the players agree to consider the hole tied. What is the ruling

Answers

In match play, when the players agree to consider the hole tied after it has begun, the ruling is known as "halving the hole."

In match play, if the players agree to consider the hole tied after it has begun, the hole is deemed halved, and the players move on to the next hole without any penalty strokes. This is called "conceding the hole" and is a common practice in match play.

This means that both players receive half a point for the hole, and the match proceeds to the next hole.

However, it's important to note that once a player has hit their ball, their opponent cannot concede the hole unless the player's ball is deemed unplayable, lost, or out of bounds. In that case, the opponent can concede the hole, and the player can move on to the next hole without completing the current one. But if both players agree to consider the hole tied before any shots are taken, the hole is halved, and the players can move on without any penalty strokes.

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SaleCo hardware store has lowered prices for some of the products, as described here: (a) all types of saws (i.e., products whose description contains the word saw) have been discounted by 15% (b) all hammers (i.e., products whose description contains the word hammer) have been discounted by 7%

Answers

A pricing policy change for a hardware store, all products containing the word "saw" in their description have been discounted by 15%, and all products containing the word "hammer" in their description have been discounted by 7%.

This statement describes a pricing strategy employed by SaleCo hardware store, which involves offering discounts on certain products. Specifically, the store has lowered prices on saws and hammers by 15% and 7%, respectively.

Discounting is a common pricing strategy used by businesses to stimulate sales and attract customers.

By lowering the prices of certain products, a store can increase the perceived value of these items and make them more appealing to customers.

This can result in increased sales, which can ultimately lead to higher profits.

The store has chosen to discount saws and hammers.

These products are likely to be in high demand among customers who engage in woodworking or DIY projects, and the discounts are intended to attract these customers and encourage them to make a purchase.

The discounts offered by SaleCo on saws and hammers are relatively modest, with a 15% discount on saws and a 7% discount on hammers. Even small discounts can have a significant impact on sales if they are applied to high-demand products.

The pricing strategy employed by SaleCo is a common one in the retail industry, and it is intended to stimulate sales and attract customers.

By offering discounts on saws and hammers, the store is hoping to increase its customer base and generate more revenue.

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Steven and his family ordered a meal that cost $136.50. Steven paid 14% sales tax and left a 20% tip on $136.50. What was the total cost?

Answers

136.50x0.14=19.11 in sales tax
136.50x0.20=27.30 in tip

136.50+19.11+27.30= $182.91 total cost

The population of a particular type of bacteria is known to triple in 16 days. What is the daily growth rate, rounded to the nearest tenth of a percent

Answers

The daily growth rate of the bacteria, rounded to the nearest tenth of a percent is approximately 7.2% .

The population of a particular type of bacteria triples in 16 days, and we need to find the daily growth rate rounded to the nearest tenth of a percent.

To find the daily growth rate, we can use the formula for exponential growth:

Final Population = Initial Population * [tex](1 + Growth Rate)^{Number of Days}[/tex]

Since the population triples, the final population is 3 times the initial population. Let's denote the growth rate as 'r' and plug the given information into the formula:

3 * Initial Population = Initial Population * [tex](1+r)^{16}[/tex]

Divide both sides by the initial population:

3 = [tex](1+r)^{16}[/tex]

Now, we need to find the 16th root of 3 to get (1 + r):

(1 + r) = [tex]3^{1/16}[/tex]

Next, subtract 1 from both sides to find the growth rate:

r = [tex]3^{1/16}[/tex] - 1

Calculate the value of r and multiply by 100 to get the percentage:

r ≈ (1.07177 - 1) * 100 ≈ 7.2%

The daily growth rate of the bacteria is approximately 7.2%, rounded to the nearest tenth of a percent. This means that the bacteria population increases by about 7.2% every day for 16 days, resulting in a tripling of the population.

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if sin of theta=1/2 and 0°<0<180 the smaller value of 0 is

Answers

30-degree is the smallest value of the [tex]\theta\\[/tex].

If sin(θ) = 1/2 and 0° < θ < 180°, then we know that θ is an acute angle in the first or second quadrant of the unit circle, since sine is positive in those quadrants.

To find the value of θ, we can use the inverse sine function (sin^-1) on both sides of the equation:

[tex]sin^{-1}(sin(\theta)) = sin{^-1}(1/2)[/tex]

θ = 30° or 150°

Since 0° < θ < 180°, the smaller value of θ is 30°.

Therefore, the smaller value of θ is 30°.

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Kamal made a replica of the Kaaba located in Mecca, Saudi Arabia. The dimensions of his replica are 24 cm long by 21 cm wide by 30 cm high. What is the surface area of the actual Kaaba in meters if the scale factor is 50

Answers

The surface area of the actual Kaaba is 1260 square meters.

To find the surface area of the actual Kaaba, we need to know the dimensions of the real Kaaba. Since we know the dimensions of Kamal's replica and the scale factor, we can use proportion to find the dimensions of the actual Kaaba.

Let x be the length of the actual Kaaba in meters.

Then we have:

x/24 = 50

x = 24 × 50 = 1200 cm = 12 meters

Similarly, the width and height of the actual Kaaba can be found using the same method:

Width of actual Kaaba = 21 cm × 50 = 1050 cm = 10.5 meters

Height of actual Kaaba = 30 cm × 50 = 1500 cm = 15 meters

Now we can find the surface area of the actual Kaaba. The surface area of a rectangular prism (which the Kaaba resembles) is given by:

Surface area = 2lw + 2lh + 2wh

Plugging in the values we found, we get:

Surface area = 2(1210.5) + 2(1215) + 2(10.5 × 15) = 1260 square meters

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Which point lies on the circle x2+y2=5?

Answers

The points that lie on the circle x² + y² = 5 are all the points that are at a distance of √5 from the origin (0,0). There are infinitely many points that lie on this circle, but some of the most common ones are (√5,0), (-√5,0), (0,√5), and (0,-√5).

Suppose a colony of cells starts with 10 cells, and their number triples every hour. After how many hours will there be 500 cells

Answers


Therefore, It will take approximately 5.68 hours for the colony of cells to reach 500, based on the given exponential equation.

In order to find out how many hours it will take for the colony of cells to reach 500, we can set up an exponential equation. Let's call the number of hours it takes for the colony to reach 500 "x". Using the information given in the problem, we know that the number of cells in the colony can be represented by the equation 10 * 3^x = 500.
To solve for x, we can divide both sides by 10 and take the logarithm of both sides. This gives us x = log(500/10) / log(3) ≈ 5.68 hours. Therefore, it will take approximately 5.68 hours for the colony of cells to reach 500.
Therefore, It will take approximately 5.68 hours for the colony of cells to reach 500, based on the given exponential equation.

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To construct a frequency distribution for categorical data, the: Group of answer choices number of observations that appear in each category must be counted. observations in each category must be multiplied by observations in the corresponding

Answers

To construct a frequency distribution for categorical data, you need to follow a systematic approach. Firstly, identify the categories or groups present in the data set.

Then, count the number of observations that appear in each category. This step is crucial as it helps you understand the distribution and frequency of each category within the dataset.

Once you have the count of observations for each category, you can proceed to calculate the relative frequencies, which are obtained by dividing the number of observations in a specific category by the total number of observations in the dataset. This step enables you to comprehend the proportion of each category in relation to the entire dataset.

Lastly, organize and present the data in a meaningful format, such as a table or a chart, to help visualize the distribution of the categorical data effectively. By following these steps, you can successfully construct a frequency distribution for categorical data and analyze the trends and patterns that emerge.

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Consider the upper bound for total numerical error E h2 eh) + M h 6 Prove that e(h) has a minimum at h = : 3€/M

Answers

To prove that e(h) has a minimum at h = 3€/M, we need to first understand the terms involved. The upper bound for total numerical error E h2 eh) + M h 6 refers to the maximum possible error in a numerical computation.

It includes two types of error: the truncation error (E h2) which results from approximating a mathematical function using a finite number of terms, and the round-off error (eh) which results from the limited precision of computer arithmetic.
The numerical error e(h) is a function of the step size h used in numerical approximations. It is given by e(h) = E h2 + M h 6 + eh.
Now, to prove that e(h) has a minimum at h = 3€/M, we can take the derivative of e(h) with respect to h and set it to zero.
de(h)/dh = 2Eh - Mh5 + eh'
Setting this equal to zero, we get:
2Eh - Mh5 + eh' = 0
Rearranging and solving for h, we get:
h = (2E/Me')^(1/4)
Substituting this value of h in e(h), we get:
e(h) = (4/3)^(3/4) * (EM)^(1/4) * eh'
Since eh' is a constant, e(h) is minimized when EM is minimized.
Therefore, we need to find the minimum value of EM, which is achieved when h = 3€/M.
Thus, we can conclude that e(h) has a minimum at h = 3€/M.

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Test the claim that the proportion of people who own cats is smaller than 30% at the 0.05 significance level. The null and alternative hypothesis would be:

Answers

If the z-score falls below the critical value, we reject the null hypothesis and conclude that the proportion of people who own cats is indeed smaller than 30%.

The null hypothesis is typically denoted as H0, and the alternative hypothesis is denoted as H1 or Ha. In this case, the hypotheses would be:

H0: The proportion of people who own cats is equal to or greater than 30%.

H1: The proportion of people who own cats is less than 30%.

We can represent this symbolically as:

H0: p >= 0.3

H1: p < 0.3

where p represents the true proportion of people who own cats in the population.

To test this claim, we can use a one-tailed z-test for proportions, where we calculate the z-score of the sample proportion and compare it to the critical value of the standard normal distribution at the chosen significance level (0.05 in this case).

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Mackenzie rows a boat downstream for 96 miles. The return trip upstream took 16 hours longer. If the current flows at 4 mph, how fast does Mackenzie row in still water

Answers

The speed of the boat in still water is 8 miles per hour.

Let's call the speed of the boat in still water "x" (in miles per hour).

When Mackenzie rows downstream, the current is helping her, so the effective speed of the boat is (x + 4) miles per hour. The distance traveled is 96 miles. We can use the formula:

distance = rate × time

to set up an equation for the downstream trip:

96 = (x + 4) t

where "t" is the time (in hours) it takes for the downstream trip.

For the upstream trip, the current is working against Mackenzie, so the effective speed of the boat is (x - 4) miles per hour. The distance traveled is still 96 miles, but this time the trip takes 16 hours longer than the downstream trip. So we can set up another equation:

96 = (x - 4) (t + 16)

Now we have two equations with two unknowns (x and t). We can solve for t in the first equation and substitute into the second equation:

96 = (x - 4) (t + 16)

96 = (x - 4) (96/(x + 4) + 16)

Simplifying, we get:

96 = (x - 4) (96/(x + 4) + 16)

96 = 96(x - 4)/(x + 4) + 16(x - 4)

96(x + 4) = 96(x - 4) + 16(x + 4)(x - 4)

96x + 384 = 96x - 384 + 16(x^2 - 16)

96x + 384 = 96x - 384 + 16x^2 - 256

16x^2 = 256 + 384 + 384

16x^2 = 1024

x^2 = 64

x = 8

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A random sample of 2000 U.S. adults were given pedometers to determine how many steps they take per day. Among the people in the sample, the average number of steps per day was 5863 with standard deviation 2870. What is the alternative hypothesis to determine how strong the evidence is that, on average, U.S. adults take fewer than 7,000 steps per day

Answers

This hypothesis aims to determine if the random sample of 2,000 U.S. adults taking an average of 5,863 steps per day with a standard deviation of 2,870 is strong evidence to support the claim that U.S. adults take fewer steps than the 7,000 steps threshold.

The alternative hypothesis in this scenario would be that the average number of steps taken by U.S. adults is less than 7,000 per day. This hypothesis is being tested to determine if there is strong evidence that the true average number of steps per day is lower than the commonly accepted average. The random sample of 2000 U.S. adults helps to ensure that the results are representative of the larger population. The alternative hypothesis for this study would be: "On average, U.S. adults take fewer than 7,000 steps per day."

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find the unknown number​

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The above are irregular polygons. Their missing external angles are given as follows:

A) x = 30°

6) x = 105°, y = 55°

B)  x = 70°; y =

F) x =  138.33°

How did we arrive at the above?

A)

Sum of angles in a pentagon = 540°

Missing internal angle = 540 - (95+100+110+85) = 150

Since exterior angle = 180 degre - it's liner pair

180 - 150 = 30°

so , x = 30°

6)

Sum of angles in hexagon = 720°

To get x and y we must find the missing internal angle (e) between vertex 105° and 145° and (f) between 105° and 115°

Since its' external angel = 45

e = 180-45 = 135°

So f = 720 - (135 + 105 + 115+ 125+ 145)

f = 95°
so x = 180-f = 180-95 = 105°

y = 180-125 = 55°

b) Sum of angles in  a heptagon = 900°

Lets call missing internal angles e1 and e2


Let e1 = 180-y
let e2 = 180-60°

e2 = 120°

So e1 = 900 - (160+120+115+110+125+115)

e1 = 155°

Since e1 = 180 -y
155 = 180-y

y = 180 - 155

y = 25°

x = 180-110

x = 70°


F)  Sum of angles in an Octagon is 1080°

To solve for x, we must realize all internal angles.
Let call the missing angle between x and x+25 e1; and

the one between 135° and (x-5) e2 and
the one between x+25 and 140 e3


e1 = 180-25 = 155°
e2 = 155°

e3 = 180-20=60°

to find x:

1080 = (x+25) + 60 + 140 + (x-5)+155+135+155+x)

collect like terms

1080 - 60 - 155- 155-140-25+5 -135 = x + x + x
415 = 3x
x = 415/3
x = 138.33°

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A committee consisting of 3 men and 5 women is selected from 5 men and 10 women. Find how many way, this committee can be formed​

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There are 2,520 ways to form a committee consisting of 3 men and 5 women from a group of 5 men and 10 women.

How to determine how many way, this committee can be formed

The combination formula gives the number of possibilities to choose a committee of three persons from a group of five:

C(5, 3) = 5! / (3! * 2!) = 10

Also, the number of ways to select a committee of 5 women from 10 women is given by:

C(10, 5) = 10! / (5! * 5!) = 252

The total number of ways to select a committee consisting of 3 men and 5 women: 10 * 252 = 2,520

Therefore, there are 2,520 ways to form a committee consisting of 3 men and 5 women from a group of 5 men and 10 women.

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We get statistics of 2017-2018 Average Starting Teacher Salaries by State measured by NEA. Given that the salary of Colorado is 33483, the sample size is 4,900 and the standard deviation is 602.694. a. What is the margin of error for a 95% confidence interval in Colorado

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To calculate the margin of error for a 95% confidence interval in Colorado, we first need to determine the critical value for a two-tailed test at a 95% confidence level. Using a standard normal distribution table, we find that the critical value is 1.96.

1. Identify the given values:
  - Average salary (µ) = 33,483
  - Sample size (n) = 4,900
  - Standard deviation (σ) = 602.694

2. Determine the critical value (z-score) for a 95% confidence interval. Using a z-table or calculator, the z-score is approximately 1.96.

3. Calculate the standard error (SE):
  SE = σ / √n
  SE = 602.694 / √4,900
  SE ≈ 8.652

4. Calculate the margin of error (ME):
  ME = z-score * SE
  ME = 1.96 * 8.652
  ME ≈ 16.96

The margin of error for a 95% confidence interval for the average starting teacher salaries in Colorado is approximately 16.96.Learn more about average here : brainly.com/question/24057012#SPJ11

The finding that more baseball players are hit with pitches by pitchers on the hottest days of the season is most consistent with:

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It is important to conduct further research to determine the underlying causes of this phenomenon and to rule out alternative explanations.

The finding that more baseball players are hit with pitches on the hottest days of the season could be due to several reasons. One possible explanation is that the heat makes the pitchers more fatigued, which could lead to them losing control of their pitches and accidentally hitting batters. Another possibility is that the heat may make the ball more difficult to grip, which could affect the accuracy of the pitch.

However, it is also possible that this finding is simply a coincidence or the result of other factors. Therefore, it is important to conduct further research to determine the underlying causes of this phenomenon and to rule out alternative explanations.

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Yvette is a veterinarian who wants to find an equation that relates the weight, in pounds, of a cat with its age, in years; its length, in inches; and its average daily intake of cat food, in calories. What is the correct format for a multiple regression equation

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The correct format for a multiple regression equation is: Weight = b0 + b1(Age) + b2(Length) + b3(Calories) + e

Yvette can use a multiple regression equation to relate the weight of a cat with its age, length, and average daily intake of cat food. The regression equation: Weight = b0 + b1(Age) + b2(Length) + b3(Calories) + e

where Weight is the cat's weight in pounds, Age is the cat's age in years, Length is the cat's length in inches, Calories is the average daily intake of cat food in calories, b0 is the constant term, b1, b2, and b3 are the coefficients for each variable, and e is the error term.

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What is the product of :- (3a^2)×(5a^3)=...........

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Answer:

I was not sure if it was positive or negative so I did both

Positive = 15a^5

Negative = -15a^5

Step-by-step explanation:

:)

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