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The arithmetic mean is simply called 'Average'. For the observations x1, x2, ….., x the A.M. is defined as

For simple frequency distribution,

For grouped frequency distribution, X; is taken as class mark.

The A.M. is sometimes called as 'Average' or 'Sample Mean'.


Example 1. Find the mean of the following data.



Solution. Here            N = Total no. of matches = 30


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