4.C[命题立意]考查正态分布;考查数学建模,数学运算的核心素养[试题解析]正态分布密度曲线示意图如图所示,曲线关于直线x=2对称,所以P(<2)=0.5,并且P(0<<2)=P(2<:<4),则P(0<:<2)=P(<4)-P(<2)=0.8-0.5=0.3故选C.

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