Youve observed the following returns on Crash-n-Burn Computers stock over the past five years: 19 percent, 13 percent, 16 percent, 21 percent, and 10 percent. a. What was the arithmetic average return on Crash-n-Burns 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 % b-1 What was the variance of Crash-n-Burns returns over this period? (Do not round intermediate calculations and round your answer to 5 decimal places, e.g., 32.16161.) Variance b-2 What was the standard deviation of Crash-n-Burns 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 %