Please show work for both problems. Thanks!

9. Calculating Returns and Variability You've observed the Page 345 following returns on Yamauchi Corporation's stock over the past five years: -10 percent, 24 percent, 21 percent, 11 percent, and 8 percent. a. What was the arithmetic average return on the stock over this fiveyear period? b. What was the variance of the returns over this period? The standard deviation? Calculating Returns and Variability You've observed the Page 345 following returns on Yamauchi Corporation's stock over the past five years: -10 percent, 24 percent, 21 percent, 11 percent, and 8 percent. a. What was the arithmetic average return on the stock over this fiveyear period? b. What was the variance of the returns over this period? The standard deviation? Calculating Real Returns and Risk Premiums For () Problem 9, suppose the average inflation rate over this period was 3.1 percent and the average T-bill rate over the period was 4.1 percent. a. What was the average real return on the stock? b. What was the average nominal risk premium on the stock