You've observed the following returns on Crash-n-Burn Computer's stock over the past five years: 4 percent, - 12 percent, 24 percent, 16 percent, and 17 percent. Requirement 1: What was the arithmetic average return on Crash-n-Burn's stock over this five year period? Requirement 2: (a)What was the variance of Crash-n-Burn's returns over this period? (Do not round intermediate calculations.) (b)What was the standard deviation of Crash-n-Burn's returns over this period? (Do not round intermediate calculations.)