统计数据：

One of the most main objectives of the statistical analysis is to get 1 single value which describes the characteristics of the entire mass of unwieldy data such a value is called as central value or the average. It is a single value, which represents the group of values.

Classification of Data:

(i) Discrete series (ii) Continuous series

TYPE OF AVERAGES

（1）平均

（a）算术（b）加权算术平均值

（c）几何平均值（d）加权几何平均值

（e）谐波平均值（F）加权谐波平均值

（2）中值

（3）模式

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