Q. 33.7( 4 Votes )

The mean weight of a class of 36 students is 41 kg. If one of the students leaves the class then the mean is decreased by 200 g. Find the weight of the student who left.

Answer :

Mean weight of 36 students = 41kg


Total weight of 36 students = 36×41 = 1476 kg


If one student leaves the class then mean decreases = 200gm = 0.2 kg


So new mean = 41 - 0.2 = 40.8kg


Total weight of 35 students = 40.8×35 = 1428 kg


Weight of the student = 1476 – 1428 = 48kg


Hence the weight of the student who left the class is 48 kg.


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