You've observed the following returns on Pine Computers's stock over the past five years: 8 percent, -12 percent, 14 percent, 21 percent, and 16 percent a. What was the arithmetic average return on the company's stock over this 5-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 enter your variance answer as a decimal (not as a percent) rounded 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.) % a. Average return b-1. Variance b-2. Standard deviation %