You've observed the following returns on Crash-n-Burn Computer's stock over the past five years: 2 percent. -12 percent, 28 percent, 19 percent, and 16 percent. What was the arithmetic average return on the company's stock over this five-year period? arded 10.60% 27 What was the variance of the company's returns over this period? 0.02556 What was the standard deviation of the company's returns over this period? 14.05%