The mean weight of 30 students of a class is 60.2 kg. Two students of weight is 50 kg and 67 kg left the class. Find the mean weight of the remaining students.
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mean weight=sum of all weight / no of students
in this case, 60.2 = Sum(30)/ 30
sum (30) = 60.2×30
2 students with 50kg and 67kg left i.e, 117kg
∴ remaining students is 28
mean of 28 students = (sum of 30 students - 117) / 28
⇒(60.2×30) - 117 / 28
⇒(1806 - 117) / 28
⇒ 60.3
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