You decide to invest in a portfolio consisting of 23 percent Stock X, 47 percent Stock Y, and the remainder in Stock Z. Based on the following information, what is the standard deviation of your portfolio? Rate of Return if State Occurs State of Economy Probability of State of Economy Stock X Stock Y Stock Z Normal .82 10.10% 3.5% 12.5% Boom .18 17.4% 25.4% 16.9% O 1.96% O 7.45% O 6.38% O 5.11%