The standard deviation of the portfolio is found by:
[W12σ12 + W22σ2 2+ 2W1W2σ1σ2ρ1,2]0.5
= [(0.40)2(0.0015) + (0.60)2 (0.0021) + (2)(0.40)(0.60)(0.0387)(0.0458)(–0.35)]0.5
= 0.0264, or 2.64%.
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