You've observed the following returns on Regina Computer's stock over the past five years: 17%, -15%, 19%, 29%, and 10% a. What was the arithmetic average return on Regina's stock over this five-year perlod? (Round the final answer to 1 decimal place.) Average return 12 b-1. What was the variance of Regina's returns over this period? (Do not round intermediate calculations. Round the final answer to 5 decimal places.) Variance 9.16 b-2. What was the standard deviation of Regina's returns over this period? (Do not round intermediate calculations. Round the final answer to 1 decimal place.) Standard deviation 7.7 %