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7nadin3 [17]
3 years ago
11

Could I have help with the part I underlined?

Mathematics
2 answers:
Ymorist [56]3 years ago
5 0
The correct answer is 192
Aleks [24]3 years ago
3 0
Ok, so first, you know 2+1 is 3, and then you divide it by 9. I bet you can figure out the rest. :)
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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 sides of the base of a right square pyramid are 5 centimeters, and the slant height is 8 centimeters. If the sides of the ba
maxonik [38]

Answer:

A

Step-by-step explanation:

3 0
3 years ago
Read 2 more answers
What is7/9 as a percentage
Kobotan [32]
I think it is 77%  or  77.7`% ,but tell me if I'm wrong
8 0
3 years ago
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Help i must get this correct i will make u brainllest<br>plzzz anyone
Fofino [41]

Answer:

22

Step-by-step explanation:

x-1 is a midsegment.

According to the Triangle midsegment theorem, x-1 is half of the third side (42)

x-1 = 42/2

x-1 = 21

x= 22

or

2x-2=42

2x=44

x=22

Hope this helps!

6 0
3 years ago
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What is the value of x in the equation 3 ( 4 x − 6 ) = − 3 ( 5 − 2 x )
valina [46]

Answer:  x = 0.3

Step-by-step explanation:

12x-18=-15+6x

6x = 3

x = 1/2 or 0.5

[Corrected]

3 0
3 years ago
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