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example 1:  if you'd taken 3 tests and gotten a 70 on the first,
an 80 on the second and a 90 on the third.  You add the three
to get 240, and then divide by 3 and your mean grade is 80.
So your average is 80.
The mean is also called the average. Add up the
series of numbers and divide by the number of
numbers in the group.
Finding the Mean of a set of Numbers
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Find The Mean of a set of Numbers
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finding the mean