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三家工厂生产螺钉:E1(产量的60%,缺陷率30%)、E2(30%,缺陷率50%)、E3(10%,缺陷率10%)。取出一个缺陷螺钉。它来自E1的概率是多少?
三家工厂生产螺钉:E1(产量的60%,缺陷率30%)、E2(30%,缺陷率50%)、E3(10%,缺陷率10%)。取出一个缺陷螺钉。它来自E1的概率是多少?
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