Dispersion is a statistical term that describes the size of the range of values expected for a particular variable.
It is mainly useful to find the relationship between the set of data. The tendency of a data scattered over a range is called as Dispersion. It is one of the most important frequency distribution. In other simple words, it can be called as a spread or variation.
Dispersion is defined as the measurement including the average deviation, variance and the standard deviation. The most widely used measure of dispersion are standard deviation and variance.