What is the standard deviation of the returns on a portfolio that is invested 52 percent in stock Q and 48 percent in stock R?

State of Economy	Probability of State of Economy	Return if State Occurs
		Stock Q	Stock R
Boom	10%	14%	16%
Normal	90	8	11

3.28 percent

2.47 percent

2.63 percent

3.41 percent

1.66 percent