Youve observed the following returns on Crash-n-Burn Computers stock over the past five years: 5 percent, 13 percent, 25 percent, 18 percent, and 15 percent.

a. What was the arithmetic average return on the company's stock over this five-year period?=10%

b. What was the variance of the company's returns over this period? This is the question I already answered A.