Question
Write down the merits of mean deviation.
Solution
Merits of Mean Deviation : 1. It is easy to understand mean Deviation.
2. Mean Deviation is less affected by extreme value than the Range.
3. Mean deviation is based on all the items of the series. It is therefore, more representative than the Range or Quartile Deviation.
4. It is very simple and easy measure of dispersion.
Demerits of Mean Deviation : 1. Mean deviation is not capable of algebraic treatment, because it ignores plus and minus signs.
2. It is not a well-defined measure since mean deviation from different averages (mean, median and mode) will not be the same
