Statistics

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formula

Arithmetic Mean

The handbook defines arithmetic mean for observations and frequency data.

\overline{x}=\frac{x_1+x_2+\cdots+x_n}{n}=\frac{\sum x_i}{n}

\overline{x}=\frac{\sum f_i x_i}{N},\quad N=\sum f_i

$x$

variable or observation

$n$

number of observations or elements