You've observed the following returns on PIne Computer's stock over the past five years: 20 percent, -12 percent, 17 percent, 20 percent, and 10 percent a. What was the arithmetic average return on the company's stock over this five-year perlod? (Do not round Intermedlate calculations and enter your answer as a percent rounded to 1 decimal place, e.g., 321.) b-1. What was the varlance of the company's returns over this perlod? (Do not round Intermedlate 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 intermedlate calculatlons and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.)