State of Economy	Probability of State of Economy	Stock A	Stock B	Stock C
Boom	0.25	0.20	0.48	0.23
Good	0.15	0.14	0.20	0.11
Poor	0.20	0.05	0.13	0.00
Bust	0.40	0.13	0.33	0.11

^ Stock A, Stock B, and Stock C are all rates of return

a. Your portfolio is invested 40 percent each in A and C and 20 percent in B. What is the expected return of the portfolio?

b-1. What is the variance of this portfolio?

b-2. What is the standard deviation?