The Optimal Risky portfolio weights for a two security (A and B) portfolio is given by
and WB= 1 - WA
These weights correspond to the point on the Capital allocation line which is tangent from the Risk free Asset point (0,RFR)
Let A be the stock fund and B be the bond fund
Here, E(RA) = 16%, stdev(A) = 35%
E(RB) = 12%, stdev(B) = 15%
Rf= 6% , Correlation coefficient = 0.13
So, WA = [(0.16-0.06)*0.152 - (0.12-0.06)*0.13*0.35*0.15] / [(0.16-0.06)*0.152 +(0.12-0.06)*0.352 - (0.16-0.06+ 0.12-0.06)*0.13*0.35*0.15]
=[0.00225-0.00041]/[0.00225+0.00735-0.001092]
=0.001841/0.008508
=0.2163 =21.63%
and WB = 1-0.2163=0.7837 =78.37%
This is the optimal portfolio weights i.e. 0.2163 invested in Stock fund and 0.7837 invested in Bond fund
The return of a portfolio is the weighted return of the two stocks
So Return of this portfolio = 0.2163 * 16% +0.7837 *12% = 12.8653%
The standard deviation of a two security portfolio is given by
So, standard deviation of portfolio =sqrt (0.21632*0.352+0.78372*0.152+2*0.2163*0.7837*0.15*0.35*0.13)
=sqrt(0.021865)
=0.147868 =14.7868%
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