The mean of 9 observations is 35 .Lately it is found that the observations 8 was misread as 18.find the correct mean
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Given :-
- The mean of 9 observations is 35.
- Correct observation is 8.
- Incorrect observation is 18.
To find :-
- The correct mean
Given that,
- Number of observations = 9
- Mean of observations = 35
We know that,
- Mean of 'n' observations is given by
So,
Now,
It is found that,
- Correct observation = 8
- Incorrect observation = 18
So correct sum is given by
So,
Now,
- Correct mean is
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