Range is the simplest possible measure of dispersion. It is the difference between the values of the extreme items of a series. Thus, if in a series relating to the weight measurements of a group of students the lightest student has a weight of 90 pounds and the heaviest of 240 pounds the value of range would be 150 pounds. This figure indicates the variability in the weight of students.

Symbolically, Range (R) = L—S where

L is the largest value and S the smallest value in a series.

Range as calculated above is an absolute measure of dispersion which is unfit for purposes of comparison if the distributions are in different units. For example, the range of the weights of students cannot be compared with the range of their height measurements as the range of weights would be in pounds and that of heights in centimeters. Sometimes, for purpose of comparison, a relative measure of range is calculated. If range is divided by the sum of the extreme items, the resulting figure is called "The Ratio of the Range" or "The Co-efficient of the Scatter."

Symbolically, The Ratio of Range or the Co-efficient of the scatter.

                                = (L-S)/(L+S)

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