So the HP12c have a very usefull function that is to get the mean and the standard deviation
ex: you have 5 observations : 1 2 3 4 5
I can do in calculator 1 M+ 2M+ 3M+ 4M+ 5M+ g s
I would get the standard devation that is 1,5811 if i square it I will have the variance that is 2,5.
Is there any shortcut do to Mean Absolute Deviation (MAD)?