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X~B(100,0.1),则E(X)D(X)=( )
X~B(100,0.1),则E(X)D(X)=( )
【正确答案】:90
【题目解析】:E(X)=100×0.1=10,D(X)=100×0.1×0.9=9,E(X)D(X)=90
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