If the economy booms, Meyer&Co. stock will have a return of 21.1 percent. If the economy goes into a recession, the stock will have a loss of 13.4 percent. The probability of a boom is 60 percent whlle the probablity of a recession is 40 percent. What is the standard devlation of the returns on the stock? 15.93% 9.70% 16 90% 15.93% 13.56% 14.79%