You own three stocks and have estimated the following joint probability distribution of returns:

Market Condition	Probability of Occurence	Return on Stock A	Return on Stock B	Return on Stock C	Return on Stock D
Growth	35%	10	80	90	30
Normal	40%	40	20	10	30
Recession	25%	80	-10	-30	30

1. Calculate the portfolios expected return and standard deviation if you invest (35% in Stock A,) (35% in Stock B), (30% in Stock C).

b. Calculate the portfolios expected return and standard deviation if you invest (25% in Stock A), (25% in Stock B) ,( 25% in Stock C), (25% in Stock D,.)