)设随机变量X~B(100,0.5),则由切比雪夫不等式估计概率P{40<X< 60}≥___________。
3/4,X~B(100,0.5),则E(X)=50,D(X)=25,所以P{40< X< 60}=P{| X- 50 |< 10}≥1- D(X)/102=3/4
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