Rate of return if state occurs
State of economy	Probability of state of economy	Stock A	Stock B	Stock C
Boom	0.2	0.24	0.45	0.33
Good	0.35	0.09	0.10	0.15
Poor	0.3	0.03	-0.10	-0.05
Bust	0.15	-0.05	-0.25	-0.09

a) Your portfolio is invested 30 percent each in A and C and 40 percent in B. Compute the expected return of the portfolio in two different ways?

b) What is the variance of this portfolio? The standard deviation?