The mean weight of 60 students of a class is 52.75 kg. If mean weight of 25 students of this class is 51 kg, find the mean weight of remaining 35 students of the class.
Solution: Total weight of 60 students = 60 × 52.75 kg = 3165 kg Total weight of 25 students = 25 × 51 kg = 1275 kg ∴ Total weight of 35 students = (3165 – 1275) kg = 1890 kg ∴ Mean weight of 35 students = 1890/35 = 54 kg
