Variance and standard deviation (expected). Hull Consultants, a famous think tank in the Midwest, has provided probability estimates for the four potential economic states for the coming year. The probability of a boom economy is 11 %, the probability of a stable growth economy is 18%, the probability of a stagnant economy is 45%, and the probability of a recession is 26%. Calculate the variance and the standard deviation stock?

Investment	Forecasted Returns for Each Economy
	Boom		Stable Growth		Stagnant		Recession
Stock	28%		12%		4%		15%
Corporate bond	10%		8%		6%		4%
Government bond	9%		7%		5%		3%