the mean of 10 observation was calculated as 40 on rechecking it was detected that the number 45 was incorrectly copied as 15. Find the correct mean .
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Solution :
The mean of 10 observations = 40
The sum of 10 observations = 40×10
= 400
If the observation 45 was wrongly
copied as 15 then
correct observation = 45 - 15
= 30
Sum of correct observations = 400+30
= 430
Correct mean = 430/10
= 43
Therefore ,
Correct mean = 43
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