You've observed the following returns on Pine Computer's stock over the past five years: -26.4 percent, 14.6 percent, 32.2 percent, 2.8 percent, and 21.8 percent. o. What was the arithmetic average return on the stock over this five-year period? Note: 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 varlance of the returns over this perlod? Note: Do not round intermediate calculations and round your onswer to 6 decimol places; e.g., 161616. c. What was the standard deviation of the returns over this period? Note: Do not round intermediote calculotions and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16