苏教版高中数学选修部分的概率知识与相关题目使不少同学感到困扰,对许多知识或题型理不清头绪.实际上,选修部分的概率知识是在必修部分基础上的进一步研究,很多情况下可直接运用必修部分的“古典概型”、“几何概型”知识求出随机变量的概率.结合随机变量自身的特点,其概率可分为如下几种类型. The probationary knowledge and related topics of the senior secondary school mathematics elective part of the Sujiao High School disturbed many students and confused many knowledge or problem types.In fact, the probabilistic knowledge of the elective part was further studied on the basis of compulsory part, and many In the case, we can directly use the “Classical Probability”, “Geometry Probability” knowledge of the compulsory part to find out the probability of a random variable.Combined with the characteristics of the random variable, the probabilities can be divided into the following types.