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The mean is the average of the numbers: a calculated "central" value of a set of numbers. To calculate: Just add up all the numbers, then divide by how many numbers there are.

eg:    mean for 2, 5, 8

answer:    2+5+8=15/3=5
               mean for 2,5,8 is 5
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It is the average of all observations. it can be defined in other words as the divisio of sum of all observations to the number of observations.

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