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siniylev [52]
3 years ago
12

Please help me thank you in advance!

Mathematics
1 answer:
Oxana [17]3 years ago
7 0

Answer:

First option: (x+9)^2=81

Step-by-step explanation:

It has the same solution

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A Gallup Poll showed that 30% of Americans are satisfied with the way things are going in the United States. Suppose a sample of
mars1129 [50]

The expected number of a distribution is its mean.

  • The expected number of Americans who are satisfied with the way things are going in the United States is 6
  • The standard deviation of Americans who are satisfied with the way things are going in the United States is 2.05

The given parameters are:

<em />\mathbf{p = 30\%}<em> --- the proportion that are satisfied</em>

<em />\mathbf{n = 20}<em> --- the sample size</em>

<em />

<u>(a) The expected number that are satisfied</u>

This is calculated using:

\mathbf{E(x) = np}

So, we have:

\mathbf{E(x) = 20 \times 30\%}

\mathbf{E(x) = 6}

The expected number of Americans who are satisfied with the way things are going in the United States is 6

<u>(b) The standard deviation of those that are satisfied</u>

This is calculated using:

\mathbf{\sigma = \sqrt{n \times p \times (1 - p)}}

So, we have:

\mathbf{\sigma = \sqrt{20 \times 30\% \times (1 - 30\%)}}

\mathbf{\sigma = \sqrt{20 \times 30\% \times 70\%}}

\mathbf{\sigma = \sqrt{4.2}}

\mathbf{\sigma = 2.05}

The standard deviation of Americans who are satisfied with the way things are going in the United States is 2.05

Read more about expected value and standard deviations at:

brainly.com/question/17088771

4 0
3 years ago
What is 547<br> divided by 8 work it out
spin [16.1K]

Answer:68.375


Step-by-step explanation:

547/8

8 can go into 54. 6 times

8*6=48

54-48=6

Bring down the 7

8 can go into 67 8 times

8*8 is 64

67-64 is 3 so the remainder is 3

The .375 is when you put a decimal than add 0

3 0
3 years ago
Give an example of a rational number that is a whole number. Show that the number is both whole and rational
DiKsa [7]

Answer:

4

Step-by-step explanation:

6 0
4 years ago
Choose what the expressions below best represent within the context of the word problem. If Sarah is 24 years younger than her m
KIM [24]
Hello Kiddo. 

This question is a bit confusing to me, but I think I grasped the concept. 
1. x best represents Sarah's mom's age. 
2. x - 24 best represents Sarah's mom's age minus how much younger Sarah is than her mom. 
3. The expression would look a little like this:
2x-24 = 68
    + 24  +24
2x = 92 
/2     /2
x = 46.

Which means, Sarah is 22 and her mom is 46 years of age. 
If you need more clarification, I'd be more than happy to elaborate further. 
5 0
3 years ago
Read 2 more answers
Can someone help me please click the picture ?
klasskru [66]
Answer: c
Reflection across the y axis
7 0
3 years ago
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