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在人教版高中数学新教材中新增了概率和统计的教学内容 ,有两类基本的抽样问题应区分清楚 1 不放回抽样问题 1 若某批产品中有a件次品 ,b件正品 ,采用不放回抽样方式从中抽n件产品(n ≤a +b) ,问正好有k件次品的概率是多少 ?解 把从a+b件产品中取出n件产品的所有可能组合作
The teaching content of probability and statistics has been added to the PEP New Mathematics Textbook. There are two basic types of sampling problems that should be clearly distinguished: 1 If there is a defective product in a batch of products, b genuine products , Using the non-return sampling method to extract n products (n ≤ a + b), and asking how many probabilities there are exactly k defective products? Solution The solution is to remove all possible combinations of n products from a+b products.