You will need
To begin, add up all the numbers from the set for which you want to find the arithmetic mean. For example, you are given a sequence of five numbers: 8, 17, 22, 14 and 29. In this case, the first step in the calculation of the arithmetic mean is finding the sum of these numbers: 8 + 17 + 22 + 14 + 29 = 90.
Now, when the amount is found, divide it by the number of summed numbers. In our set had 5 numbers, so we divide 90 by 5. 90 : 5 = 18. The resulting number will be the average of the original set of numbers.
The arithmetic mean is intended to describe the Central tendency, however, is sometimes hindered by the influence of "large deviations". For example, the arithmetic mean of a set of numbers 2, 1, 1, 2, 1, 11 shall be three, whereas most of the elements of the series (five of six) is clearly below this value.