Youve observed the following returns on Crash-n-Burn Computers stock over the past five years: 2 percent, 15 percent, 27 percent, 15 percent, and 18 percent.

What was the arithmetic average return on the company's stock over this five-year period?

What was the variance of the company's returns over this period?

What was the variance of the company's returns over this period?

What was the standard deviation of the companys returns over this period?