Please explain what is sum of deviations and solve the sum.... In an easy manner no links plz.. Take this question a bit personally. Thnx

​Q1. The sum of deviations of a set of values x1 , x2, xy.............. , yAP measured from 50 is – 10 and the sum of deviations of the values from 46 is 70. Find the value of n and the mean.

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