正态分布是《概率与统计》一章中的难点.为了学好这一内容,现把这一节的知识概要作一介绍,供学习时参考。一、知识解析1.正态分布的概念在频率分布直方图中,当样本容量越大,组数越多,组距越小时,那么直方图的上端就会无限接近于一条光滑曲线——总体密度曲线.在正常情况下,该曲线是密度函数 Normal distribution is a difficult point in the chapter “Probability and Statistics.” In order to learn this content, a brief summary of the knowledge in this section is provided for reference when learning. First, the knowledge of analysis 1. The concept of normal distribution In the frequency distribution histogram, when the sample size is larger, the more the number of groups, the smaller the group spacing, then the upper end of the histogram will be infinitely close to a smooth curve - the overall Density curve. Under normal conditions, the curve is a function of density