Q2 of 96 Page 157

While computing mean of grouped data, we assume that the frequencies are

In grouping the data all the observations between lower and upper limits of class marks are taken in one group then mid value or class mark is taken for further calculation.

In computing the mean of grouped data, the frequencies are centered at the class marks of the classes.

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1

In the formula for finding the mean of grouped data di’s are deviation from a of

3

If xi’s are the mid - points of the class intervals of grouped data, fi are the corresponding frequencies and is the mean, then is equal to

 4

In the formula for finding the mean of grouped frequency distribution is equal to

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The abscissa of the point of intersection of the less than type and of the more than type cumulative frequency curves of a grouped data gives its