You've observed the following returns on Mary Ann Data Corporation's stock over the past five years: 39.00 percent, 2 24.00 percent, -26.00 percent, and 13.00 percent. a. What was the arithmetic average return on Mary Ann's stock over this five year period? (Do not round intermediate cal Round the final answer to 2 decimal places.) Arithmetic average return b-1. What was the variance of Mary Ann's returns over this period? (Do not round intermediate calculations. Round the fi to 6 decimal places.) Variance b-2. What was the standard deviation? (Do not round intermediate calculations. Round the final answer to 2 decimal pla Standard deviation % %