you've observed the following returns on crash-n-burn computer's stock over the past five years: 14 percent, - 7 percent, 17 percent, 15 percent, and 10 percent.

a.) what was the arithmetic average return on the company stock over five-year period?

b.) what's was the varian of the company's return over this period?

c.) what was the standard deviation of the company's return over this period?