8.72%
SD of portfolio = SQRT(W1^2 *SD1^2 + W2^2*SD2^2+ 2*W1*W2*SD1*SD2*CorrAB )
= SQRT(0.6^2*0.19^2+0.4^2*0.16^2+2*0.6*0.4*0.19*0.16*-0.65)
= SQRT(0.0076072)
= 0.08722
=8.72%
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