The average height of 30 boys was calculated to be 150

The average height of 30 boys was calculated to be 150
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The average height of 30 boys was calculated to be 150 cm. It was detected later that one value of 165 cm was wrongly copied as 135 cm for the computation of the mean. Find the correct mean.

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Right Answer is:

SOLUTION

Average height=m=150cm
no of students =n=30

new mean =(m*n+165-135)/n
=(150*30+165-135)/30
=(4500+30)/30
=4530/30
=453/3
=151
therefore
correct mean =151cm

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