The mean of 10 observations was found to be 30. If two observations were wrongly taken as 32 and 12 instead of 23 and 11, find the correct mean.
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2
Answer:
29.9
Explanation:
The total no. of observations are 100
The mean of those observations are 30
So The sum of observations is 30×100=3000
The wrong observations are 32 and 12
Those are to be subtracted from sum of observations
So, 3000−32−12=2956
The correct observations are 23 and 11
Those are to be added
So, 2956+23+11=2990
The mean is given by
100
2990
=29.9
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