what is class interval ?
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the size of each class into which a range of a variable is divided, as represented by the divisions of a histogram or bar chart.
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here is yøur answer
The class intervals are the subsets into which the data is grouped. The width of the class intervals will be a compromise between having intervals short enough so that not all of the observations fall in the same interval, but long enough so that you do not end up with only one observation per interval
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