A portfolio manager summarizes the input from the macro and micro forecasters in the following table:

Micro Forecasts
Asset	Expected Return (%)			Beta	Residual Standard Deviation (%)
Stock A		22		1.5		60
Stock B		19		1.8		72
Stock C		18		1.0		61
Stock D		13		1.0		56

Macro Forecasts
Asset	Expected Return (%)			Standard Deviation (%)
T-bills		9			0
Passive equity portfolio		17			23

a. Calculate expected excess returns, alpha values, and residual variances for these stocks. (Negative values should be indicated by a minus sign. Do not round intermediate calculations. Round "Alpha values" to 1 decimal place.)

b. Compute the proportion in the optimal risky portfolio. (Do not round intermediate calculations. Enter your answer as decimals rounded to 4 places.)