Problem 12-9 Calculating Returns and Variability [LO1]

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 the companys stock over this five-year period? (Do not round intermediate calculations and enter your answer as a percent rounded to 1 decimal place, e.g., 32.1.)
b-1.	What was the variance of the companys returns over this period? (Do not round intermediate calculations and round your answer to 5 decimal places, e.g., .16161.)
b-2.	What was the standard deviation of the companys returns over this period?