The range reports the difference between the minimum and maximum numbers of a data set.

Range = the high number minus the low number (7.7 - 4.9 = 2.8).

Range is often used to compare measurements of data within a data set (usually a series of trials). Generally, the lower the range, the greater the accuracy. The greater the range, the lower the accuracy, which indicates a problem with the way the data was collected or a problem in the procedure. A range of 2.8 for Example #1 above is high in comparison to the value of each of the numbers. Data collection was probably not done consistently!