Youve observed the following returns on Doyscher Corporations stock over the past five years: 27.6 percent, 15.4 percent, 33.8 percent, 3.2 percent, and 22.2 percent.

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

(a)

What was the variance of the returns over this period?

(b)	What was the standard deviation of the returns over this period?