The performance of the common stock of Apple Stores is highly dependent upon the state of the economy. In a boom economy, the stock is expected to return 22.0% in comparison to 9.8% in a normal economy and negative 10.0% in a recessionary period. The probability of a recession is 14%. There is a 23% chance of a boom economy. The remainder of the time the economy will be at normal levels. What is the standard deviation of the returns on Apple stock? Multiple Choice 10.01% 11.52% 3.21% 9.44% 4.34%