To find the mean, or average, of a group of numbers, add together each of the numbers in the group. Then, divide this total by the number of numbers in the group.

**Calculate the total**Add together each number in the group to obtain the total, or sum, of the numbers. If numbers are duplicated, include each occurrence in the sum.

**Count the numbers**Count how many numbers are in the group. If the same number occurs more than once, it should be counted more than once.

**Calculate the mean**Calculate the mean by dividing the sum of the numbers in the group by the count of the numbers in the group.