The mean of 10 observations was calculated as 40. It was detected on rechecking that the value of 45 was wrongly copied as 15.Find the correct mean.
Given :
The mean of 10 observations = 40
One of the value was wrongly entered as 15 instead of 45.
To find :
We have to find he correct mean.
Solution :
This implies,
The sum of 10 observations $= 40\times10 = 400$
The sum of correct observations $= 400-45+15 = 430$
Therefore,
Correct mean $= \frac{430}{10} = 43$
The correct mean is 43.
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