Discussion
Which of the following is not an 'absolute measure of dispersion' ?
Answer: D
The one that is not an absolute measure is the coefficient of variation.
Absolute measures of dispersion are expressed in the units of the data, rupees or kilograms for instance. The coefficient of variation is the standard deviation divided by the mean, multiplied by 100, so the units cancel and it is a pure percentage. That makes it a relative measure, used to compare the variability of series with different units or averages.
The range, mean deviation and standard deviation are all absolute measures, expressed in the units of the original data.
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