Explanation:

- Option 1: Range

- This is an absolute measure of dispersion as it measures the difference between the maximum and minimum values in a dataset.

- Option 2: Mean Deviation

- This is also an absolute measure, representing the average of absolute deviations from a central point (mean or median).

- Option 3: Quartile Deviation

- This is an absolute measure of dispersion that looks at the spread of the middle 50% of a dataset.

- Option 4: Coefficient of Variation

- This is a relative measure of dispersion, expressed as a percentage of the mean. It compares the degree of variation between different data series regardless of unit.

Correct Answer: Option:4 i.e. Coefficient of Variation