You've observed the following returns on Doyscher Corporation's stock over the past five years: -24.6 percent, 13.4 percent, 29.8 percent, 2.2 percent, and 21.2 percent What was the arithmetic average return on the stock over this five-year period? Arithmetic average return % What was the variance of the returns over this period? variance What was the standard deviation of the returns over this period? Standard deviation