You find the mean, and find the mean of the mean.
Mean=5
Data set: 1 2 3 5 6 9 9
Calculate how far away the other numbers are from the mean
New data set from doing above: 4 3 2 0 1 4 4
Find the mean of that data set.
Mean absolute deviation= 2.6
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Mean Absolute Deviation
If I have understood the question correctly, despite your challenging spelling, the standard deviation is the square root of the average of the squared deviations while the mean absolute deviation is the average of the deviation. One consequence of this difference is that a large deviation affects the standard deviation more than it affects the mean absolute deviation.
Absolute deviation from what?
The mean absolute deviation is 5
No. Mean absolute deviation is usually greater than 0. It is 0 only if all the values are exactly the same - in which case there is no point in calculating a deviation! The average deviation is always (by definition) = 0