新课标苏教版选修2-3第2章概率,主要以超几何分布与二项分布模型为重点,通过实例,让学生认识模型所刻画的随机变量的共同特点,从而建立新的模型,并能运用两模型解决一些实际问题.然而在教学过程中,却发现学生不能准确地辨别所要解决的问题 The new curriculum superscript Sujiao version elective 2-3 Chapter 2 probability, mainly to hypergeometric distribution and binomial distribution model as the focus, through examples to enable students to recognize the common characteristics of the model described by the random variables in order to establish a new model, And can use two models to solve some practical problems.However, in the teaching process, they found that students can not accurately identify the problem to be solved