Perhaps you are referring to a set.
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The numerical average of a group of numbers is the ratio of the sum of group of numbers to the total amount of numbers. This is also known as the mean.
Average of the numbers in a group =(the sum of all the numbers in the group) divided by (the number of numbers in the group)
A set
You group the numbers 11,12,1,2.Then you group the numbers 10,9,3,4.last you group the numbers 8,7,6,5.
The middle number out of a group of numbers.