If the economy booms, Mayer&Co. stock will have a return of 18.5 percent. If the economy goes into a recession, the stock will have a loss of 75 percent. The probability of a boom is 71 percent whle the probablity of a recession is 29 percent. What is the standard deviation of the returns on the stock? s 71 percen 15 percent 18.5 percent 0a85% o 723% 11.84% 753% 0822% o 885%