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kari74 [83]
3 years ago
9

Can somebody please help with this?

Mathematics
1 answer:
Kay [80]3 years ago
7 0

Answer:

  A.  2.9π(9²)

Step-by-step explanation:

You are expected to know that the area of a circle is given by the formula ...

  A = πr²

and that r in the formula represents the radius of the circle, half the diameter.

The area of the circular base of the cylinder is the area of a circle with a radius of 9 feet. It will be ...

  A = π(9²)

When that is multiplied by the height of the cylinder to find its volume, you have ...

  V = Bh

  V = (π(9²))(2.9)

This can be rearranged to match the form in answer choice A:

  2.9π(9)²

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2. Suppose over several years of offering AP Statistics, a high school finds that final exam scores are normally distributed wit
nirvana33 [79]

Answer:

By the Central Limit Theorem, the mean is 78, the standard deviation is s = \frac{6}{\sqrt{n}} and the shape is approximately normal.

Step-by-step explanation:

Central Limit Theorem

The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

Mean of 78 and a standard deviation of 6

This means that \mu = 78, \sigma = 6

Samples of n:

This means that the standard deviation is:

s = \frac{\sigma}{\sqrt{n}} = \frac{6}{\sqrt{n}}

What are the mean, standard deviation, and shape of the distribution of x-bar for n?

By the Central Limit Theorem, the mean is 78, the standard deviation is s = \frac{6}{\sqrt{n}} and the shape is approximately normal.

6 0
3 years ago
I need help I give all the points I can it’s
babunello [35]

Answer:

1)(8+18w)

2) -24d-20

3)6w-16

4) correct

5)-10d+2

Step-by-step explanation:

5 0
3 years ago
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20.) Using the cross multiplication method, which of the following is the solution to 18/6x = 4/(x+3)?
Likurg_2 [28]

Answer:

B. 9

Step-by-step explanation:

7 0
3 years ago
If f(x) = 2x2 - x, find f(-3). <br> 15 <br> 21 <br> 39
elixir [45]
I believe its 21 sorry if im wrong
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3 years ago
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Please help ! Struggling with this one :(
creativ13 [48]

Answer A becouse:

x-=20

y=55

y-35=2(x-10)

y=2x-20+35=40-20+35=55

6 0
3 years ago
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