Statistics 简明教程
Statistics - Arithmetic Mean
算术平均值是用来衡量中心趋势的最常见且最易于理解的度量。我们可以把平均值定义为用测量值之和除以数据集中包含的测量值数量而得到的值，用符号 $\bar{x}$ 表示。
Arithmetic Mean in the most common and easily understood measure of central tendency. We can define mean as the value obtained by dividing the sum of measurements with the number of measurements contained in the data set and is denoted by the symbol $\bar{x}$.
我们准备讨论针对三种类型的序列计算 Arithmetic Mean 的方法：
We’re going to discuss methods to compute the Arithmetic Mean for three types of series:
Individual Data Series
当数据是以个体为基础给出时。以下是关于个体序列的一个例子：
When data is given on individual basis. Following is an example of individual series:
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