Problem 12-9 Calculating Returns and Variability (LO1] You've observed the following returns on Crash-n-Burn Computer's stock over the past five years: 18 percent, -3 percent, 16 percent, 11 percent, and 10 percent. a. What was the arithmetic average return on Crash-n-Burn's stock over this five-year period? (Do not round intermediate calculations, Enter your answer as a percent rounded to 1 decimal place, e.g., 32.1.) Average return 10.4% b-1 What was the variance of Crash-n-Burn's returns over this period? (Do not round intermediate calculations and round your answer to 5 decimal places, e.g. 32.16161.) Variance b-2What was the standard deviation of Crash-n-Burn's returns over this period? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places, e.g. 32.16.) Standard deviation 8.2%