Problem 12-9 Calculating Returns and Variability [LO1] You've observed the following returns on Pine Computer's stock over the past five years: 16 percent, -5 percent, 19 percent, 13 percent, and 10 percent. a. What was the arithmetic average return on the company's stock over this five-year period? (Do not round intermediate calculations and enter your answer as a percent rounded to 1 decimal place, e.g., 32.1.) b-1. What was the variance of the company's returns over this period? (Do not round intermediate calculations and round your answer to 5 decimal places, e.g., .16161.) b-2. What was the standard deviation of the company's returns over this period? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Problem 12-10 Calculating Real Returns and Risk Premiums [LO1] You've observed the following returns on Pine Computer's stock over the past five years: 12 percent, -12 percent, 19 percent, 24 percent, and 10 percent. Suppose the average inflation rate over this period was 2.5 percent and the average T-bill rate over the period was 3.2 percent. a. What was the average real return on the company's stock? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) b. What was the average nominal risk premium on the company's stock? (Do not round intermediate calculations and enter your answer as a percent rounded to 1 decimal place, e.g., 32.1.)