You?ve observed the following returns on Doyscher Corporation?s 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 live-year period? (Do not round intermediate calculations. Enter your answer as a percentage rounded to 2 decimal places (e.g., 32.16).) Requirement 2: (a) What was the variance of the returns over this period? (Do not round intermediate calculations. 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 round intermediate calculations. Enter your answer as a percentage rounded to 2 decimal places (e.g., 32.16).) Standard deviation %