You've observed the following returns on Crash-n-Burn Computer's stock over the past five years: 13 percent, -8 percent, 16 percent, 16 percent, and 10 percent. a) What was the arithmetric average return on Crash-n-Burn's stock over the 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?