The mean weight of 60 students of a class is 52.75 kg. If the mean weight of 25 of them is 51 kg, find the mean weight of the remaining students.
Mean weight of 60 students = 52.75 kg
Sum of weight of 60 students = 60×52.75 = 3165 kg
Mean weight of 25 students of them = 51kg
Sum of weight of 25 students = 51×25 = 1275 kg
Sum of weight of remaining 35 students = Sum of weight of 60 students - Sum of weight of 25 students
= 3165 – 1275 = 1890 kg
Mean of remaining 35 students = 
Hence mean of remaining students is 54kg.
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