Youve observed the following returns on Pine Computer's stock over the past five years. 252 percent, 13.8 percent. 306 percent. 24 percent, and 214 percent a. What was the anthmelic average return on the stock over this five-year period? Note: Do not round intermediate calculations and enter your answer as o percent rounded to 2 decimal places, e.9.. 3216 . b. What was the variance of the returns over this period? Note: Do not round intermediate calculations and round your answer to 6 decimal places, e.9. .161616. c. What wos 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