Arithmetic Mean

Arithmetic Mean

Quotient of the sum of the values in the distribution of a quantitative statistical characteristic by the number of values.


  • The arithmetic mean of a distribution is noted as: \(\overline{\textrm{x}}\).
    Some books prefer the notation \(\overline{\textrm{X}}\).
  • When it is necessary to distinguish between the mean of an entire population and the mean of a sample, the mean of the entire population is generally noted as: μ.


If a distribution E includes the data \(x_1, x_2, x_2, x_3, x_4, …, x_n\), then the arithmetic mean of E is given by:

\(\overline{\textrm{x}} = \dfrac{x_1 + x_2 + x_2 + x_3 + x_4 + … + x_n}{n}\)


Consider the numbers: 3, 5, 7, 9, 11, 13.
The arithmetic mean of these numbers is: \(\overline{\textrm{x}}\) = \(\frac{3\space +\space 5\space +\space 7\space +\space 9\space +\space 11\space +\space 13}{6}\) = 8.

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