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3 years ago

Can any one please help me in number 4

Mathematics

1 answer:

Novay_Z [31]3 years ago

4 0

Answer:

150.72

Step-by-step explanation:

The volume of a cylinder is 2πrh. We have r = 3 and h = 8 so volume is 48π or 150.72.

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620,000 rounded to the nearest ten thousand

lina2011 [118]

Your answer would be 600,000

3 0

3 years ago

Read 2 more answers

Choose the number that is less than:3.15 x 10A.1.11 x 10B.9.9 x 10C.36,500D.3.26 x 10

Leto [7]

The Answer is A……… hope this helps

5 0

3 years ago

PLEASE HELP ME!!!!!!!!<br> I WILL MARK YOU BRAINLIEST

AlekseyPX

Answer:

Step-by-step explanation:

Hope this helps :)

3 0

3 years ago

You are interested in estimating the the mean age of the citizens living in your community. In order to do this, you plan on con

AlladinOne [14]

Using the z-distribution, a sample size of 180 is needed for the estimate.

<h3>What is a z-distribution confidence interval?</h3>

The confidence interval is:

$\overline{x} \pm z\frac{\sigma}{\sqrt{n}}$

The margin of error is given by:

$M = z\frac{\sigma}{\sqrt{n}}$

In which:

$\overline{x}$ is the sample mean.

z is the critical value.

n is the sample size.

$\sigma$ is the standard deviation for the population.

In this problem, we have a 98% confidence level, hence $\alpha = 0.98$ , z is the value of Z that has a p-value of $\frac{1+0.98}{2} = 0.99$ , so the critical value is z = 2.327.

The population standard deviation is of $\sigma = 23$ , and to find the sample size, we have to solve for n when M = 4.

Hence:

$M = z\frac{\sigma}{\sqrt{n}}$

$4 = 2.327\frac{23}{\sqrt{n}}$

$4\sqrt{n} = 2.327 \times 23$

$\sqrt{n} = \frac{2.327 \times 23}{4}$

$(\sqrt{n}) = \left(\frac{2.327 \times 23}{4}\right)^2$

n = 179.03.

Rounding up, as a sample size of 179 would result in an error slightly above 4, a sample of 180 is needed.

More can be learned about the z-distribution at brainly.com/question/25890103

#SPJ1

8 0

2 years ago

The graph shows the number of each kind of book in Hero's personal library. A book is

skelet666 [1.2K]

Answer:

$\displaystyle p=\frac{1}{15}$

Step-by-step explanation:

<u>Probability</u>

The simple probability of a random event can be calculated as the ratio between the possible favorable cases and the total possible cases.

The pie chart shows the number of books in Hero's library grouped by category.

The total number of books is 14 + 10 + 4 + 2 = 30

The number of romance books is 2

Thus, the probability of randomly choosing a romance book out of the total books is:

$\displaystyle p=\frac{2}{30}$

Simplifying:

$\mathbf{\displaystyle p=\frac{1}{15}}$

This corresponds to the first option

6 0

3 years ago