Question

Formula of mean in statistics for grouped data

Answer 1

To calculate the mean of grouped data, the first step is to determine the midpoint (also called a class mark) of each interval, or class. These midpoints must then be multiplied by the frequencies of the corresponding classes. The sum of the products divided by the total number of values will be the value of the mean.


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Answer 2

Mean can be taken out by three methods for grouped data:

1.Direct method:
Mean = Sumation of fixi/fi.

2.Assumed mean method:
a+(Sumation of fidi/fi)h where a is assumed mean and h is width of class interval.

3.Step Deviation Method:
a+(Sumation of fidi/fi)h.

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