Arithmetic Mean

Definition

是一组数据之和,除以这组数据个数/项数。

Denoted

\ {\bar {x}} \

Formula

\[ {\bar {x}}={\frac {\sum _{{i=1}}^{n}x_{i}}{n}}={\frac {x_{1}+x_{2}+\cdots +x_{n}}{n}} \]

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