已知随机变量X服从正态分布N(μ,σ 2 ),且P(μ-2σ<X≤μ+2σ)=0.9544,P(μ-σ<X≤μ+σ)=0.6826,若μ=4,σ=1,则P(5<X<6)=( ) A.0.1358 B.0.1359 C.0.2716 D.0.2718
∵随机变量X服从正态分布N(μ,σ 2 ), P(μ-2σ<X≤μ+2σ)=0.9544, P(μ-σ<X≤μ+σ)=0.6826, μ=4,σ=1, ∴P(2<X≤6)=0.9544, P(3<X≤5)=0.6826, ∴P(2<X≤6-P(3<X≤5)=0.9544-0.6826=0.2718, ∴P(5<X<6)=
故选B. |