in class interval 17.5 and 20.5 find the class size and class marks
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Class mark :-
= (upper limit + lower limit) ÷ 2
= (20.5 + 17.5) ÷ 2
= 38 ÷ 2
= 19 Ans
Class size :-
= Upper limit - lower limit
= 20.5 -17.5
= 3 Ans
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