20. Arithmetic and Geometric Returns A stock has had returns of 26 percent, 12 percent, 34 percent, 8 percent, 27 percent, and 23 percent over the last six years. What are the arithmetic and geometric average returns for the stock? 9. Calculating Returns and Variability You've observed the 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 five-year period? b. What was the variance of the returns over this period? The standard deviation