You decide to invest in a portfolio that consists of 25 percent X Stocks, 43 percent Y Stocks and the remainder Z Stocks. What is the standard deviation of your portfolio based on the information below?

Economic Status	Condition probability			Return If Situation Occurs
	economy
				Stok X			Stock Y			Stock Z
Normal		.83			%11.40			%4.80			%13.80
Boom		.17			%18.70			%26.70			%18.20