概率论与数理统计试题,
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概率论与数理统计试题,
概率论与数理统计试题,
概率论与数理统计试题,
p(1/2<ξ<3/2)=p(1/2<x≤1)+p(1≤x<3/2)
=∫x dx(x从1/2到1的定积分)+∫(2-x)dx(x从1到3/2的定积分)
=(1/2)x²(x从1/2到1)+[2x-(1/2)x²](x从1到3/2)
=(1/2)(1-1/4)+[3-(1/2)×﹙9/4﹚]-[2-(1/2)]
=3/4