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 28.50% -12.50% 3 12.50% 03.16.87% b: 20.66% 1 2 C 29.22% d. 7.54% 9.24%