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.
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.