If you calculate the sum of deviation scores from each data point in a dataset from the mean of the dataset, you will always end up with a sum of 0.

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Quizplus · Accepted Answer

This is because the sum of the deviations above the mean will always be equal to the sum of the deviations below the mean. Therefore, when you sum all of these deviations together, they cancel each other out and result in a sum of 0.

If You Calculate the Sum of Deviation Scores from Each