Youve observed the following returns on Staverosky Corporations stock over the past five years: 25.8 percent, 14.2 percent, 31.4 percent, 2.6 percent, and 21.6 percent. Requirement 1: What was the arithmetic average return on the stock over this five-year period? (Do not include the percent sign (%). Round your answer to 2 decimal places (e.g., 32.16).) Arithmetic average return % Requirement 2: (a) What was the variance of the returns over this period? (Round your answer to 6 decimal places (e.g., 32.161616).) Variance (b) What was the standard deviation of the returns over this period? (Do not include the percent sign (%). Round your answer to 2 decimal places (e.g., 32.16).) Standard deviation %