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一、问题的提出文[1]中提出这样的一个问题:“某仪表厂从供应商处购置元器件20件,双方协商的验货的规则是:从中任取3件进行检测,若3件中无不合格品,则这批元器件被接受,否则就要重新对这批元器件进行逐个检查.若该批元器件不合格品率为20%,求3件中不合格元器件的分布列及期望”.这是一道高三的质量检验题,文[1]中给出了处理此题的参考答案和学生的答案.
First, the issue raised in the text [1] put forward such a question: “A meter factory from the supplier to purchase 20 pieces of components, the rules of consultation between the two sides is: from which to take three for testing, if 3 None of the pieces of non-conforming product, the batch of components is accepted, otherwise it is necessary to re-check the batch of components one by one.If the batch of devices unqualified rate of 20%, seeking 3 pieces of substandard components distribution Columns and expectations ”This is a high school quality test questions, article [1] is given to deal with this question reference answers and students’ answers.