某工厂生产某种电子产品,每件产品不合格的概率均为
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,现工厂为提高产品声誉,要求在交付用户前每件产品都通过合格检验,已知该工厂的检验仪器一次最多可检验
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件该产品,且每 件产品检验合格与否相互独立.若每件产品均检验一次,所需检验费用较多,该工厂提出以下检 验方案:将产品每
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个
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一组进行分组检验,如果某一组产品检验合格,则说明该组内产品均合格,若检验不合格,则说明该组内有不合格产品,再对该组内每一件产品单独进行检验,如此,每一组产品只需检验1次或
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次.设该工厂生产1000件该产品,记每件产品的平均检验次 数为X.