Required: a. Calculate expected excess returns, alpha values, and residual variances for these stocks. b. Compute the proportion in the active portfolio and the passive index. c. What is the Sharpe ratio for the optimal portfolio? d. By how much did the position in the active portfolio improve the Sharpe ratio compared to a purely passive index strategy? e. What should be the exact makeup of the complete portfolio (including the risk-free asset) for an investor with a coefficient of ris aversion of 2.8 ? Complete this question by entering your answers in the tabs below. Calculate expected excess returns, alpha values, and residual variances for these stocks. Note: Negative values should be indicated by a minus sign. Do not round intermediate calculations. Round "Alpha values" to 1 decimal place. Calculate using numbers in decimal form, not percentages. For example use " 20 " for calculation if standard