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244 bytes added ,  13:52, July 10, 2007
Be careful which sort of average you're talking about
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The '''mean''' is of a group of numbers is one way to express their [[average]].  To find the mean, the numbers are added and divided by the quantity of numbers in the group.  For example: to find the mean of 3, 4, 6, and 7, we add them together: <math>3 + 4 + 6 + 7 = 20</math>.  Then we divide them by the quantity of numbers in the group, which is 4.  <math>20/4 = 5</math>.
 
The '''mean''' is of a group of numbers is one way to express their [[average]].  To find the mean, the numbers are added and divided by the quantity of numbers in the group.  For example: to find the mean of 3, 4, 6, and 7, we add them together: <math>3 + 4 + 6 + 7 = 20</math>.  Then we divide them by the quantity of numbers in the group, which is 4.  <math>20/4 = 5</math>.
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Most spreadsheet programs and computer languages consider ''average'' to be the mean, but there are three common types of [[average]]. Often the [[median]] is far from the [[mean]], when values are skewed in one direction (see also [[mode]]).
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