The mean weight of 60 students of a class is 52.75 kg. If the mean weight of 35 of them is 54 kg, find the mean weight of the remaining students.
Solution:
Mean weight of 60 students of a class=52.75 kg
So the total weight of 60 students = 52.75 × 60
= 3165 kg
Mean weight of 35 students among them = 54 kg
So the total weight of 35 students = 54 × 35
= 1890 kg
Remaining students = 60 – 35
= 25
Total weight of 25 students = 3165 – 1890
= 1275 kg
So the mean weight of 25 students = 1275 ÷ 25
= 51 kg
Hence, the mean weight of the remaining students is 51 kg.
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