Disadvantage of standard Deviation
It is not easy to understand and calculate.
It gives more weight to the extremes and less to the items nearer to mean. Since the squares of the deviation of bigger size would be proportionate greater than which are comparatively small. The deviation 2 and 6 are in the ration of 1:3 but their squares 4 and 36 would be in the ration of 1.9.