Find the mean deviation about the median for the data 13,17,16,14,11,13,10,16,11,18,12,17.
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Arranging the data in ascending order 10,11,11,12,13,13,14,16,16,17,17,18 Here the numbers of observations n=12 (even) M=2(212)thobservation+(212+1)thobservation M=26thobservation+7thobservation M=213+14=227=13.5
The deviations of the respective observation from the median, i.e.xi−M are