【考情分析】高考中,离散型随机变量的概率分布问题常以考查随机变量的分布列、期望、方差为主,其中二项分布与正态分布是常见的随机变量概率分布模型.这类问题往往是以实际问题为背景,结合常见的概率事件来进行考查.问题多在解答题中出现,属于中等偏难的问题.【复习要点】(1)理解取有限个值的离散型随机变量及其分布列的概念,了解分布列对于刻画随机现象的重要性.(2)理解n次独立重复试验模型 In the college entrance examination, the probability distribution problem of discrete random variables is often based on the distribution, expectation, and variance of random variables. Binomial distribution and normal distribution are common random variable probability distribution models. The problem is often based on the actual problem, combined with common probabilistic events to examine. Problems arise in the answer questions, which are moderately difficult questions. [Review points] (1) To understand discrete random variables with finite values And the concept of its distribution column, to understand the importance of distribution columns for characterizing random phenomena. (2) To understand n independent repeat test models