The returns on the common stock of New Image Products are quite cyclical. In a boom economy, the stock is expected to return 23 percent in comparison to 14 percent in a normal economy and a negative 18 percent in a recessionary period. The probability of a recession is 22 percent while the probability of a boom is 18 percent. What is the standard deviation of the returns on this stock ? 11.56 percent 12.08 percent 13.71 percent 14.51 percent