You’ve observed the following returns on crash-n-burn computer’s stock over the past five years: 17 percent, –4 percent, 20 percent, 12 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?