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在新教材概率部分的教学过程中 ,发现有几个常见题较易出错 .举例如下 :例 1 某种产品 1 0 0件 ,其中有次品 5件 ,现从中任意抽取 6件 ,求恰有一个次品的概率 .错解 由题意知 ,这种产品的次品率为 5 %,且每次抽取相互独立 ,由独立和重复试验概率公式 ,得 :6件产品中恰有 1件?
In the teaching process of the probabilistic part of the new textbook, it is found that there are several common questions that are more prone to errors. Examples are as follows: Example 1 There are 100 products of a certain type, of which there are 5 defective products, and 6 are randomly selected from them. The probability of a defective product. The misunderstanding of the problem is known. The defective rate of this product is 5%, and each extraction is independent of each other. From the independent and repeated test probability formula, there is one product out of 6 products.