Q. 23.7( 12 Votes )

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.

Answer :

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.


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