Where Correlation between two securities is "-1<r<1", we can reduce the risk but "not to Zero".
However Investment shall be made at minimum variance portfolio.
Assume The name of Stock fund is "S" & Bond fund is "B" for convineience.
Investment in Stock Fund = (SD of B)2 - r*SD of S * SD of B / [ (SD of S)2 + (SD of B)2 - 2 . r * SD of S * SD of B ]
= [ (0.23)2 - 0.15 * 0.32 * 0.23 ] / [ (0.32)2 + (0.23)2 - 2 * 0.15 * 0.32 * 0.23 ]
= [ 0.0529 - 0.01104] / [ 0.1024 + 0.0529 - 0.02208 ]
= 0.04186 / 0.13322
= 0.3142 i.e 31.42 % in stock fund & 68.58% IN Bond fund.
Portfolio return is Weighted Average return of securities in that portfolio.
Let x be weight of investment in Stock fund S & 1-X be the weight of Investment in Bond fund
Given portfolio Return = 12 %
Thus 0.12 = 0.09 + 0.06X
0.06X = 0.03
x = 0.03/0.06 i.e 50%
SD of Portfolio = Square root { (Ws* SD of S)2 + (WB* SD of B)2 + 2 * r * Ws* SD of S * WB* SD of B }
= Square root { (0.5* 0.32)2 + (0.5* 0.23)2 + 2 * 0.15 *0.5* 0.32 * 0.5* 0.23}
=Square root { (0.16)2 + (0.115)2 + 0.00552 }
=Square root { 0.0256 + 0.0132 + 0.00552 }
=Square root {0.0443 }
= 0.2106 i.e 21.06%
Portfolio SD = 21.06%
Pls comment, if any further assistance is required.
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