Q. 44.3( 9 Votes )

The average weight of a class of 39 students is 40 kg. When a new student is admitted to the class, the average decreases by 200 g. Find the weight of the new student.

Answer :

Mean weight of 39 students = 40kg


Total weight of 39 students = 39×40 = 1560 kg


If a new student is admitted to the class, the average decrease by = 200g = 0.2 kg


So new average weight = 40 - 0.2 = 39.8kg


Total weight of 39 students and 1 new student = 39.8×40 = 1592 kg


Weight of new student = 1592 – 1560 = 32kg


Hence the weight of the new student is 32 kg.


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