Problem 12-9 Calculating Returns and Variability (L01) You've observed the following returns on Regina Computer's stock over the past five years: 15%, -15%, 17%, 27%, and 10% a. 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 7% 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 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 % Problem 12-16 Arithmetic and Geometric Returns (L01) A stock has had the following year-end prices and dividends: Price Dividend $ Yes 1 2 3 4 5 43.51 48.49 57.41 45.49 52.41 61.49 $0.81 0.84 0.95 1.00 1.08 What are the arithmetic and geometric returns for the stock? (Do not round Intermediate calculations. Round the final answer to 2 decimal places.) Arithmetic return Geometria return