Question

Why do we need measure of dispersion?

Answer 1

Answer:

Dispersion are important for describing the spread of the data, or its variation around central value.

Answer 2

Answer:

Because it's a measure of spread, sometimes also called a measure of dispersion, is used to describe the variability in a sample or population. It is usually used in conjunction with a measure of central tendency, such as the mean or median, to provide an overall description of a set of data.