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一、问题提出:在人教版教材选修2-3中,第二章第1节阐述了这样一个新的概念:设有总数为N件的两类物品,其中一类有M件,从所有物品中任取n件(n≤N),这n件中所含第一类物品件数X是一个离散型随机变量,它取值为m时的概率为:
I. PROBLEM PROPOSALS: In the elective version 2-3 of the PEP, the second section, Section 1, expounds a new concept: There are two categories of articles in total, N, of which one is M, The article takes n pieces (n≤N). The number of the first type of articles contained in the n pieces of X is a discrete random variable whose probability is m when the value is m: