独立重复试验是研究随机现象的重要途径之一,很多概率模型的建立都以独立重复试验为背景,二项分布就是来自于独立重复试验的一个概率模型.正态分布是概率统计中最重要的一种分布,也是自然界最常见的一种分布.一般说来,若影响某一数量指标的随机因素很多,而每个因素所起的作用都不太大,则这个指标服从正态分布. Independent repetitive testing is one of the important ways to study random phenomena.Many probabilistic models are set up in the context of independent experiments and the binomial distribution is a probability model from independent experiments.normal distribution is the most important factor in probability statistics A distribution is also the most common distribution in nature. Generally speaking, if there are many random factors that affect a certain number of indicators, and each one does not play a significant role, then the indicator follows a normal distribution.