Rube Bressler owns three stocks and has estimated the following joint proba- bility distribution of returns: Outcome Stock A Stock B Stock C Probability 1 -10 10 0 .30 2 0 10 10 .20 3 10 20 5 15 .30 -10 .20 Calculate the portfolio's expected return and standard deviation if Rube invests 20% in stock A, 50% in stock B, and 30% in stock C. Assume that each security's return is completely uncorrelated with the returns of the other securities.