You've observed the following retums on Pine Computer's stock over the post five yeors: -27.6 percent, 15.4 percent, 33.8 percent, 3.2 percent, and 222 percent. a. What wos the orithmetic overage return on the stock over this five-year period? Note: Do not round intermedlate calculations and enter your answer as a percent rounded to 2 decimal places, e.g. 3216. b. What wos the variance of the returns over this period? Note: Do not round intermedlate calculations and round your answer to 6 decimal places, eg. 161616. c. What wos the standard deviation of the returns over this period? Note: Do not round intermedlate calculations and enter your answer as a percent rounded to 2 decimal places, e.g. 3216