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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: 2 percent, -11 percent, 23 percent, 15 percent, and 13 percent. What was the arithmetic average return on the company's stock over this five-year period? Average retum 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