What is the new mean age?

The mean age of 18 students of a class is 14.5 years. Two more students of age 15 years and 16 years join the class. What is the new mean age?

Solution:

Mean age of 18 students = 14.5 years
Total age = 14.5 × 18
= 261 years
Total age of 2 more students = 15 + 16
= 31 years
Total age of 18 + 2 = 20 students = 261 + 31
= 292 years
Mean age = 292/20 =
14.6 years
Hence, the new mean age is 14.6 years.

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