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一、知识要点1．总体和样本总体所考察对象的全体．个体总体中的每一个考察对象．样本从总体中抽取的一部分个体叫做总体的一个样本．样本容量样本中个体的数目叫做样本客量．2．平均数计算公式（1）3．众数和中位数众数在一组数据中，出现次数最多的数据叫做这组数据的众数．
First, knowledge points 1. Overall and overall population of the sample Each object in the individual population. The part of the sample taken from the population is called a sample of the population. The number of individuals in the sample size sample is called the sample size. 2. The average calculation formula (1)3. Modes and Median Modes In a set of data, the most frequently occurring data is called the mode of the data.