Introduction to mean of deviation

Introduction to mean of deviation:

Deviation is nothing but The difference between observed value and the expected value of a function . . This is basically mean deviation as the "mean deviation from the mean," the introduction of the complete value makes logical calculations using this statistic much more difficult.

central value ‘a’, to get dispersion of values of x

we find the deviations about a. To calculate the mean need know the sum of the deviations.

Mean deviation=sum of deviations/Number of observations

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