In order to find the range of a data set, researcher need to identify only two characteristics, the largest and smallest values.

Although the range is easy to calculate and to understand, it is generally not a very useful measure of variability.

The disadvantage of the range is that it depends only on the highest and lowest observations.

The range of a data set is the difference between the largest and smallest values.

In grouped frequency distribution, the value of the range will only be the lowest value.