Ben has $80,000 to invest and chooses to allocate his money among only Stocks P and Q. He invests three times as much in Stock P as compared to his investments in Stock Q. What is the standard deviation of the returns of his portfolio?

State of Economy	Probability of State of Economy	Return if State Occurs
		Stock P	Stock Q
Boom	25%	11%	5%
Normal	45%	8%	6%
Recession	25%	-5%	8%
Depression	5%	-45%	12%