Question 21 6.5 pts What is the standard deviation of the returns on a portfolio that is invested 45 percent in stock A and 55 percent in Stock B? State of Economy Probability Returns if State Occurs of State of Economy Stock A Stock B Boom 10% 14% 16% Normal 90% 8% 11% 2.63 percent 3.41 percent 3.28 percent O 1.64 percent 0 2.47 percent