Youve observed the following returns on Crash-n-Burn Computers 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-Burns stock over this five-year period? b-1 What was the variance of Crash-n-Burns returns over this period? b-2 What was the standard deviation of Crash-n-Burns returns over this period?