Answer :

Class marks of the given frequency distribution are = 47, 52, 57, 62, 67, 72, 77


(i) Class size = 52 – 47 = 5


(ii) Class size = 5


Mid value = = 2.5


Class marks = 52


Upper class limit = 52 + 2.5 = 54.5


Lower class limit = 52 – 2.5 = 49.5


(iii) Here classes are in the exclusive form,


So true class limit for class mark 52 is 49.5 – 54.5


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