Given the following information, what is the standard deviation of the returns on a portfolio that is invested 40 percent in Stock A, 35 percent in Stock B, and the remainder in Stock C? Rate of Return if State Occurs State of bbity of Stock A Stock B Stock C Economy State Occurring Growth 18.9 0212.1 5.7 8.5 9.3 O2.43 percent O 168 percent O 316 percent O 16.57 percent O 672 percent