A portfolio manager summarizes the input from the macro and micro forecasters in the following table: Hier forecasts Expected Return (%) Asset Stock A Stock Stock Stock D Standard Deviation) 76 Be 69 17 16 11 2. 1.e 1.0 Macro Forecast Expected Return Asset () T-hills 7 Passive equity portfolio 15 Standard Deviation (3 25 a. Calculate expected excess returns, alpha values, and residual variances for these stocks (Negative values should be indicated by o minus sign. Do not round Intermediate calculations. Round "Alpha values" to 1 decimal place.) Stock C Stock Stock A Stock B % Excess returns Alpha values Residual variances b. Compute the proportion in the optimal risky portfolio. (Negative values should be indicated by a minus sign. Do not round Intermediate calculations. Enter your answer os decimals rounded to 4 places) Proportion