In statistics, the range of a set of data is the difference between the largest and smallest values. It can give you a rough idea of how the outcome of the data set will be before you look at it. It is the result of subtracting the smallest value from largest value. In math, range is a statistical measurement of dispersion, or how much a given data set is stretched out from smallest to largest.

However, in descriptive statistics, this concept has a more complex meaning. The range is the size of the smallest interval (statistics) which contains all the data and provides an indication of statistical dispersion. It is measured in the same units as the data. Since it only depends on two of the observations, it is most useful in representing the dispersion of small data sets. Range happens to be the lowest and the highest numbers subtracted. It mostly highlights how different the numbers are in a data set, and there is a simple formula to calculate:

Range formula


Wikipedia. Range (Statistics).