<p>Here is my answer in English:</p><p> Portfolio: Port = 4/6 *A + 2/6 *B, </p><p> So Cov(Port, A) = Cov(4/6 *A + 2/6 *B, A) </p><p> = 4/6 *Cov(A,A) + 2/6 *Cov(B,A)</p><p> = 4/6*Var(A) + 2/6 *0 (As A and B are independent)</p><p> = 4/6*(0.06)^2 ( As Var(A) = Std(A)^2 = (0.06)^2 ) </p><p> = 0.0024</p><p> Is that clear?</p><p></p><br>alexyzhuo
金钱 +20
奖励 2008-9-26 9:50:06
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