The mean age of 30 students in a class is 14 years, 5 students with the mean age of 15 years left the class, find the mean age of  remaining students.

Mean age of 30 students = 14 years
So, total age of the 30 students = 30*14 = 420 years

Mean age of 5 students that left = 15 years
So, total age of the 5 students = 5*15 = 75 years

Total students remaining = 30 - 5 = 25
Total age of the remaining 25 students = 420 - 75 = 345 years

So, the required mean = 345 / 25 = 13.8 years

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