The class marks of a frequency distribution are 44, 52, 60, 68, 76, 84 . Find the class size and all the class intervals.
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If one the classes is 63−72 then the range of the class is 10 (72 included)
Range of the given data points =112−30=82
Number of classes =1082=8.2
Classes required will be 9 after round off.
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