Hi everyone,

Sorry if this question is too random or general, but itīs bugging me.

Why do we write the mean absolute variation like this:

$\displaystyle

\psi=\frac {1}{N} \sum_{i=1}^N|x_i-\mu|

$

and not like this?:

$\displaystyle

\psi=\frac {\sum_{i=1}^N|x_i-\mu|}{N}

$

i.e. why do we multiply the sum of deviations by 1/N, instead of just dividing the sum of deviations by N?

Thanks