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Mila [183]
3 years ago
12

3

Mathematics
1 answer:
disa [49]3 years ago
5 0

Answer:

21

20.7

20.23

20.22

20.102

20.005

Step-by-step explanation:

hope this helps!

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Please help I really need it ​
Tju [1.3M]

Answer:

113.04

Step-by-step explanation:

C= 2πr

(2)(3.14)(18) = 113.04

5 0
2 years ago
What is negative twenty-five plus twenty-five
SVEN [57.7K]

Negative and a positive makes a negative.


So, -25 + 25 = 0

6 0
3 years ago
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The water works commission needs to know the mean household usage of water by the residents of a small town in gallons per day.
valina [46]

Answer:

A sample of 179 is needed.

Step-by-step explanation:

We have that to find our \alpha level, that is the subtraction of 1 by the confidence interval divided by 2. So:

\alpha = \frac{1 - 0.85}{2} = 0.075

Now, we have to find z in the Ztable as such z has a pvalue of 1 - \alpha.

That is z with a pvalue of 1 - 0.075 = 0.925, so Z = 1.44.

Now, find the margin of error M as such

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

In which \sigma is the standard deviation of the population and n is the size of the sample.

A previous study found that for an average family the variance is 1.69 gallon?

This means that \sigma = \sqrt{1.69} = 1.3

If they are using a 85% level of confidence, how large of a sample is required to estimate the mean usage of water?

A sample of n is needed, and n is found for M = 0.14. So

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

0.14 = 1.44\frac{1.3}{\sqrt{n}}

0.14\sqrt{n} = 1.44*1.3

\sqrt{n} = \frac{1.44*1.3}{0.14}

(\sqrt{n})^2 = (\frac{1.44*1.3}{0.14})^2

n = 178.8

Rounding up

A sample of 179 is needed.

7 0
3 years ago
Determine the length of a chord whose central angle is 150° in a circle with a radius of 223 centimeters. Question 12 options: 1
faltersainse [42]

Answer:

4) 430.8 centimiters

Step-by-step explanation:

3 0
3 years ago
Help ASAP please!
Iteru [2.4K]

Answer:A

Step-by-step explanation:

it is A

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3 years ago
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