Question

Can someone help me please i'm so lost

Answer 1

see the attached

Explanation:

Step 1.

The sample size is the number of numbers. There are 10 of them.

n = 10

The mean is the sum of the numbers (1240) divided by the number of them (10).

`\overline{x}=(1240)/(10)=124`

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Step 2.

It is convenient to let a spreadsheet (or calculator) do the math. Enter the numbers and the formulas shown in the table, and let the spreadsheet do the rest.

`\sum{(x-\overline{x})^2}=1494`

The formulas for the sample variance and sample standard deviation are given. Fill in the numbers you have so far and do the indicated calculation.

`s^2=\frac{\sum{(x-\overline{x})^2}}{n-1}=(1494)/(9)=166\\\\s=√(166)\approx 12.88`