超几何分布是概率分布列中很重要的一个题型,其实质是古典概率模型的推广,题型特点比较鲜明,解题步骤也很直接。但要细究起来,却有颇多“道道”。例1:袋中有红球6个,白球4个,从中摸出2个小球,求摸到红球的个数ξ的分布列及期望。 Hypergeometric distribution is a very important problem in the probability distribution column. Its essence is the popularization of the classical probability model. The characteristics of the question types are quite distinct, and the solving steps are also very direct. But to fine study, but there are quite a lot of “Road Road.” Example 1: There are 6 red balls and 4 white balls in the bag, and 2 small balls are found out from the bag, seeking the distribution column and expectation of the number of red balls.