Arithmetic Mean : Grouped Data

Economics

formula

Arithmetic Mean by Direct Method

Mean,
Where,
 Sum of all the frequencies. This is also denoted by .
 Sum of the product of frequencies and corresponding observations.

formula

Arithmetic Mean of grouped data using step deviation

Step Deviation Method: Calculating the Mean by using Step Deviation Method. 
Mean,
Where,
Class size

 The middle value that is assumed as the mean for calculation,
 Sum of the frequencies given, can be denoted by .

formula

Weighted Arithmetic Mean

If the frequencies of variables be respectively, then

Mean

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Arithmetic Mean : Ungrouped Data

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