Youve observed the following returns on Yasmin Corporations stock over the past five years: 19 percent,

Question:

You’ve observed the following returns on Yasmin Corporation’s stock over the past five years: 19 percent, – 13 percent, 24 percent, 31 percent, and 8 percent.
a. What was the arithmetic average return on Yasmin’s stock over this five-year period?
b. What was the variance of Yasmin’s returns over this period? The standard deviation?