The mean of 10 observations is 12.5 . While calculating the mean one observation was by mistake taken as -8 instead of +8 . Find the correct mean.
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Mean is given by .
Thus, given that the mean of 10 observations is 12.5, that means .
Let the sum of the observations excluding the “wrongly added -8” be , then .
Thus, the correct sum of observations is given by .
Therefore, the correct mean is .