You've observed the following returns on Crash-n-Burn Computer's stock over the past five years: 3 percent, -8 percent, 23 percent, 20 percent, and 15 percent Requirement 1: What was the arithmetic average return on Crash-n-Burn's stock over this five year period? (Click to select) Requirement 2: (a) What was the variance of Crash-n-Burn's returns over this period? (Do not round intermediate calculations.) (Click to select) (b) What was the standard deviation of Crash-n-Burn's returns over this period? (Do not round intermediate calculations.) (Click to select)