You've observed the following returns on Crash-n-Burn Computer's stock over the past five years: 18 percent. -14 percent. 20 percent. 22 percent, and 10 percent. a. What was the arithmetic average return on Crash-n-Bum's stock over this five-year period? Average return 11.2 % b-1 What was the variance of Crash-n-Bum's returns over this period? Variance b-2What was the standard deviation of Crash-n-Bum's returns over this period? Standard deviation 14.80 %