Youve observed the following returns on Crash-n-Burn Computers stock over the past five years: 15 percent, 15 percent, 17 percent, 27 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.)

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.)

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.)