Question

The mean weight of 120 students of a school is 52. 75 kg. If the mean weight of 50 of the id 51 kg, find the mean weight of the remaining students.

Answer 1

Answer:

Mean of 120 student = 52.75 kg

Total weight of 120 student = 52.75 × 120 = 6330

Mean of 1st 50 student = 51

Total weight of 50 student = 51 × 50 = 2550

So, weight of last 70 student = 6330 - 2550 = 3780

Mean weight = 3780/70 = 54

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