Problem 12-9 Calculating Returns and Variability (LO1) You've observed the following returns on Regina Computer's stock over the past five years; 17%,15%,19%,29%, and 10%. 0. What was the arithmetic average return on Regina's stock over this five-year period? (Round the final answer to 1 decimal place.) Average return b-1. What was the varianse of Regina's returns over this period? (Do not round intermediate colculations. Round the final answer to 5 decimel pleces.) Variance b-2. What was the standard deviation of Regina's returns over this period? (Do not round intermediate calculations. Round the final onswer to 1 decimal place.) Standard deviation