This problem is most easily solved using a spreadsheet; for accuracy input percentages as decimals or use the % sign, do not input as if these were integers. Do not do any interim rounding, calculate values to 6 decimal places before converting to percentages, state the answer to two places, do not use labels (%, $). For example, if the value is 0.06458, the answer is 6.46.

Given the following information about past returns for Saphir Netmarketing, what is the standard deviation of returns?

Year Return

1 -4.30%

2 8.30%

3 3.20%

4 -1.20%

5 6.70%