Arithmetic average; arithmetic mean (statistics)

算术平均数（统计）

In order to reflect changes in the average level of the phenomenon, we can calculate an index by compare the arithmetic average of two different periods.

为了反映现象平均水平的变动，可将两个不同时期的算术平均数相比，求出一个指数。

The arithmetic average value of the records shall as the measured value.

以每小时读数的算术平均值作为测定值.