Problem 12-9 Calculating Returns and Variability (L01) Youve observed the following returns on Regina Computer's stock over the past five years: 11%, -11%, 18%, 23% and 10% a. What was the arthmetic average retum on Regina's stock over this five-year period? (Round the final answer to 1 decimal place.) Average return 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.) Varance b-2. What was the standard deviation of Regina's returns over this period? (Do not round Intermedlate calculations, Round the final answer to 1 decimal place.) Standard deviaton 12.99