Problem 12-9 Calculating Returns and Variability [LO1]

Youve observed the following returns on Crash-n-Burn Computers stock over the past five years: 16 percent, 5 percent, 19 percent, 13 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? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.)

a.	Average return	10.6	%
b-1.	Variance
b-2.	Standard deviation	9.34	%

I have tried several different methods to find the variance and cannot come up with the correct answer. Most of the solved attempts for this question give the variance as a percentage, however this is not what this question is asking.