what is the varience? please help

You've observed the following returns on Doyscher Corporation's stock over the past five years: -28.5 percent, 16.0 percent, 35.0 percent, 3.5 percent, and 22.5 percent. Requirement 1: What was the arithmetic average return on the stock over this five-year period? (Do not round intermediate calculations. Enter your answer as a percentage rounded to 2 decimal places (e.g., 32.16).) Arithmetic average return 9.7 % 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 468.26