Question

Average height of 30 students is 150 cm it was later found the one observation is 165 which was wrongly copied as 135 cm. Find the correct mean height.

Answer 1

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

Answer 2

Hi there!
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What is Mean?

The average of a given set of numbers is called the Arithmetic mean, or simply the mean, of the given numbers.

Mean = $\frac{Sum \: of \: observations } {Number \: of \: observations }$

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For your solution to the given question refer to the attachment.

Thanks for the question!

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