The two assets, X and Y, whose returns are shown in the multivariate distribution to the right, have the following expected returns, variances, a. What is the expected return and standard deviation of a portfolio that is 50% Asset X and 50% Asset Y ? b. What is the expected return and standard deviation of a portfolio that is 75% Asset X and 25% Asset Y ? c. Which of the preceding portfolios ((a) or (b)) is better? Why