If the economy booms, SEU's stock will have a return of 23.5 percent. If the economy goes into a recession, the stock will have a loss of 12 percent. The probability of a boom is 68 percent while the probability of a recession is 32 percent. What is the standard deviation of the returns on the stock? Multiple Choice O 14.72% o 15.85% O 16.56% O O 13.49% O 9.68%