设E(X),E(Y),D(X),D(Y)及Cov(X,Y)均存在,则D(X-Y)=()
A.D(X)+D(Y)
B.D(X)-D(Y)
C.D(X)+D(Y)-2Cov(X,Y)
D.D(X)-D(Y)+2Cov(X,Y)
正确答案是C
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