You've observed the following returns on Pine Computer's stock over the past five years: -28.2 percent, 15.8 percent. 34.6 percent, 3.4 percent, and 22.4 percent a. 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 variance of the returns over this period? Note: Do not round intermediate colsulations and round your answer to 6 decimal places, e.g., 161616. c. What was the standard deviation of the returns over this period? Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16 . Answer is complete but not entirely correct