**Arithmetic Mean**

An **arithmetic mean** is also known as the mean or average of a set of numbers.

To find the arithmetic mean of a set of numbers, we add all the numbers in the set and divide the sum by the number of elements in the set.

For example, find the arithmetic mean of the set of numbers below:

\left\{ {6,1,4,0,2,5} \right\}The sum of the numbers in the set is 6+1+4+0+2+5=18.

There are six elements or entries in the set.

Therefore, the arithmetic mean is {{18} \over 6} = 3.