Returns for the Dayton Company over the last 3 years are shown below. What's the standard deviation of the firm's returns? (Hint: This is a sample, not a complete population, so the sample standard deviation formula should be used.) Do not round your intermediate calculations.

Year		Return
1		18.00%
2		-12.50%
3		27.50%

a. 29.56%

b. 7.59%

c. 20.90%

d. 17.06%

e. 6.20%