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