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 19.50% 1 2. -12.50% 3 27.50% a. 29.93% b. 21.17% c. 6.13% d. 7.51% e. 17.28%