The mean weight of 34 students of a school is 42 kg. If

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The mean weight of 34 students of a school is 42 kg. If the weight of the teacher be included the mean rises by 400g. Find the weight of the teacher?

Here n= 34, a = 42 and b = 42.4
Weight of the teacher.
= n(b -a) + b
= 34 ( 42.4 - 42) + 42.4
= 13.6 + 42.4 = 56.0 kg