Youve observed the following returns on Crash-n-Burn Computers stock over the past five years: 5 percent, -10 percent, 28 percent, 19 percent, and 15 percent.

What was the arithmetic average return on Crash-n-Burns stock over this five year period?

What was the variance of Crash-n-Burns returns over this period? (Do not round intermediate calculations.)

What was the standard deviation of Crash-n-Burns returns over this period? (Do not round intermediate calculations.)