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The mean age of 25 teachers in a school is 40 yearsA teacher retires at the age of 60 years and a new teacher is appointed in his placeIf the mean age of the teachers in this school now is 39 years, then the age of the newly appointed teacher is

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answer is 35.

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Detailed Solution

n=25, mean is 40mean=∑xn⇒∑x=25×40=1000New sum =1000−60+x=940+xNew average is 39940+x25=39975=940+xx=35
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