The formula for estimating average unbiased absolute error (AUE) is

, where $\latex n$ is the number of items in the data set and Average error is the mean of the minimum and maximum values which are likely to be left over or increased in the process of rounding.

For example, rounding a value nearest to hundred, the chances are that the lowest value which may be left out is 0 and maximum value which may be added is 50. Hence, the average error is .

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