I'm sure this is what you meant by average...
Arithmetic Mean
The most commonly used type of average. To find the arithmetic mean of a set of n numbers, add the numbers in the set and divide the sum by n.
Formula:http://www.mathwords.com/a/a_assets/...%20formula.gifExample:For the numbers 4 and 9,
http://www.mathwords.com/a/a_assets/...%20example.gif
Median of a Set of Numbers
The median of a set of numbers is the value for which half the numbers are larger and half are smaller. If there are two middle numbers, the median is the arithmetic mean of the two middle numbers.