Q4 of 174 Page 597

The class marks of a frequency distribution are 15, 20, 25, 30…..

The class corresponding to the class mark 20 is

Class marks = 20 (given)


Class size = 20 – 15 = 5


Lower class limit = (20 – 5/2 ) = 20 – 2.5 = 17.5


Upper class limit = (20 + 5/2) = 20 + 2.5 = 22.5.


Hence,


Class mark 20 will lie in class 17.5 – 22.5

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