Why does the mean obtained from ungrouped data differ from grouped data? ( lesson- statistics: NCERT- grade 10)
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Mean for grouped data :
In these distribution, it is assumed that frequency of each class interval is centered around its mid-point i.e class marks
whereas mean for ungrouped data :
example of ungroup Frequency table
marks obtained no of students
25 4
35 10
45 23
65 34
and the formula to find it is given in picture.
Hope it will help you
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