This calculator finds the average (arithmetic mean) of a collection of numbers.
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To take the average of a group of numbers, you simply sum it then divide by the size of the group. For example, there are 3 numbers in the list 1, -42, 5, so the average is: \begin{equation} \frac{1 -42 + 5}{3} = -12. \end{equation} In mathematical notation the arithmetic mean can be written as: \begin{equation} \frac{1}{n}\sum\limits_{i = 0}^n a_i = \frac{1}{n}(a_1 + a_2 + \dots + a_n). \end{equation}