You've observed the following returns on Crash-n-Burn Computer's stock over the past five years: 14 percent, -7 percent, 17 percent, 15 percent, and 10 percent. a. What was the arithmetic average return on Crash-n-Burn's stock over this five-year period? b-1 What was the variance of Crash-n-Burn's returns over this period? b-2 What was the standard deviation of Crash-n-Burn's returns over this period