Answer :

(i) The number of eldest teacher = 1


youngest teachers in the school = 2


(ii) 35-40 age group teachers are more in the school.


50-55 age group teachers are least.


(iii) Size of the classes = 5 years


(iv) Class marks of the classes = average of class intervals = 32.5, 40, 47.5, 55, 62.5, 70, 77.5


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