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| Merits and Demerits of Mean Deviation |
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| Merits: |
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 Mean deviation is easy to calculate. This measure is simple to |
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| understand. |
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 This can be calculated from any average. |
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 Its value is based upon all the (observations) items of the data. |
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 It is less affected by extreme observations. |
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 It gives us an idea about how the items are situated in the distribution. |
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| Demerits: |
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 This is mathematically incomplete because it ignores negative signs. |
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 As it can be calculated from any average, it does not have certainty (i.e., it is not a well defined measure). |
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 Its use is very limited in statistical work. |
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