You've observed the following returns on Crash-n-Burn Computer's stock over the past five years: 5 percent, -9 percent, 25 percent, 19 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)