We've observed the following returns on Yasmin Corporation's stock over the past five years: 17 percent, -4 percent, 20 percent, 12 percent, and 10 percent.

a.What was the arithmetic average return on the company's stock over this five-year period? (one decimal)

b-1What was the variance of the company's stock returns over this period?(five decimals)

b-2What was the standard deviation of the company's stock returns over this period? (two decimals)