The mean weight of a class of 34 students is 46.5 kg. If the weight of the teacher is included, the mean rises by 500 g. Find the weight of the teacher.
Mean weight of 34 students = 46.5kg
Total weight of 34 students = 34×46.5 = 1581 kg
If the weight of a teacher is included then mean arises = 500gm = 0.5 kg
So new mean = 46.5 + 0.5 = 47kg
Total weight = 47×35 = 1645 kg
Weight of a teacher = 1645 – 1581 = 84kg
Hence the weight of a teacher is 64 kg.