Answer:
see the attached
Step-by-step 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).
[tex]\overline{x}=\dfrac{1240}{10}=124[/tex]
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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.
[tex]\sum{(x-\overline{x})^2}=1494[/tex]
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.
[tex]s^2=\dfrac{\sum{(x-\overline{x})^2}}{n-1}=\dfrac{1494}{9}=166\\\\s=\sqrt{166}\approx 12.88[/tex]
