You’ve observed the following returns on crash-n-burn computer’s stock over the past five years: 18 percent, –3 percent, 16 percent, 11 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.)