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单项选择题X和X2是两个独立的随机变量，Var(X-X2)和Var(XX2)相比，理论上有

A、Var(X-X2)＞Var(XX2)

B、Var(X-X2)Var(XX2)

C、Var(X-X2)≠Var(XX2)

D、Var(X-X2)＝Var(XX2)

E、Var(X-X2)≥Var(XX2)

  • E

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