P12-9 Calculating Returns and Variability (LO1) You've observed the following returns on Crash-n-Burn Computer's stock over the past five years: 4 percent, -15 percent, 28 percent, 19 percent, and 15 percent. What was the arithmetic average return on the company's stock over this five-year period? Average return 10.20% What was the variance of the company's returns over this period? Variance What was the standard deviation of the company's returns over this period? Standard deviation