Problem 10-9 Calculating Returns and Variability [LO 1]

Youve observed the following returns on Yamauchi Corporations stock over the past five years: 24.9 percent, 13.6 percent, 30.2 percent, 2.3 percent, and 21.3 percent.
a.	What was the arithmetic average return on the stock over this five-year period? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.)
b.	What was the variance of the returns over this period? (Do not round intermediate calculations and round your answer to 6 decimal places, e.g., 32.161616.)
c.	What was the standard deviation of the returns over this period? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.)