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)
正确答案:E
答案解析:有
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医师定期考核
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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
-X2)＞Var(XX2)-X2)Var(XX2)-X2)≠Var(XX2)-X2)＝Var(XX2)-X2)≥Var(XX2)微信扫一扫手机做题