Question

The class marks of a frequency distribution are 15,20,25...... The class corresponding to class marks 20 Wii be

Answer 1

Class size= difference between two successive class marks
So the class size will be 20-15=5
Lower class limit=class mark-class size/2
=20-5/2
=17.5
Upper class limit=lower class limit+class interval
=17.5+5=22.5
Class limits=>17.5-22.5
Hope it helps!!
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Answer 2

17.5 -- 22.5 ......,......