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The mean ago of 25 teachers in a schools...

The mean ago of 25 teachers in a schools is 40 years. A teacher retires at the age of 60 years and a new teacher is appointed in his place . If now the mean age of the teachers in this schools is 39 years, then the age (in years) of the newly appointed teacher is

A

35

B

30

C

40

D

25

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The correct Answer is:
A
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AAKASH SERIES-APPENDICES (REVISION EXERCISE)-Statistics
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  15. The mean of a data set consisting of 20 observation is 40. If one obse...

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  16. In a set of 2n distinct observations, each of the observations below ...

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