Question

the sum of deviations of the items from their arithmetic mean always

Answer 1

I think it help you

The sum of the deviations from themean is zero. This will always be the case as it is a property of the samplemean, i.e., the sum of the deviationsbelow the mean will always equal the sum of the deviations above the mean. However, the goal is to capture the magnitude of these deviations in a summary measure.