Question

the mean age of club is 42 years. what is mean age of that club after 5 years

Answer 1

as the mean age of club is 42
since after 5 years everyone`s age will increase by 5
so mean will also get increase by 5
thus new mean will be 42+5 = 47 year

Answer 2

Hi.

Here is your answer---

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The Mean age of the Club = 42 years.

If each term of the Mean is increase or decreased by the same number, then mean is also increased or decreased by the same number.

Thus,
After 5 years, each and every one or part's age will be increased by 5 years. 
Thus, if each age will increase by five years, as a result of which Mean's age will also increased by 5 years.


After 5 years,
  Mean age = 42 + 5 
                   = 47 years.

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Hope it helps.

Have a nice day.