The class marks of a frequency distribution are 15,20,25,.....Find the class corresponding to class mark 20 and 25.
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the difference between 15 and 20 is 5 . so we do have of 5 so it is 2.5
simran273:
and add 2.5 in 20 and sub 2.5 in 15 so there will make a class interval
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