h Hegative after the fact Explain. 9, Calculating Returns and Variability[LO1 You've observed the follow ing retuim on Crash n Burm Computer's stock over the past five years: 7 percent, 13 r 21 percent, 3d percent, and 15 percent. a. What was the arithmetic average retum on Crash n Burn's stock over this Ie year period deviation? 10. Caleulating Real Rot t, what was the variance of Crash n Burn's returns over this period , lhe start ard uud