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SashulF [63]
2 years ago
10

It is known that the variance of a population equals 1,936. A random sample of 121 has been taken from the population. There is

a .95 probability that the sample mean will provide a margin of error of a. 7.84 b. 31.36 c. 344.96 d. 1,936
Mathematics
1 answer:
olasank [31]2 years ago
7 0

Answer:

It is known that the variance of a popualtion equals 1,936.

Step-by-step explanation:

That should be correct!!!

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Answer:

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Step-by-step explanation:

1. We assume, that the number 900 is 100% - because it's the output value of the task.

2. We assume, that x is the value we are looking for.

3. If 900 is 100%, so we can write it down as 900=100%.

4. We know, that x is 3.5% of the output value, so we can write it down as x=3.5%.

5. Now we have two simple equations:

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where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that:

900/x=100%/3.5%

6. Now we just have to solve the simple equation, and we will get the solution we are looking for.

7. Solution for what is 3.5% of 900

900/x=100/3.5

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900=28.571428571429*x       - we divide both sides of the equation by (28.571428571429) to get x

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now we have:

3.5% of 900=31.5

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Step-by-step explanation:

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