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【多选题】
设随机变量x服从二项分布b(10，0.9)，则其均值与标准差分别为（ ）。A.
E(X)=10
B.
E(X)=9
C.
Vax(X)=0.3
D.
Vax(X)=0.9
E.
Vax(X)=0.3
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