Range is the difference between the highest and the lowest value is series. This is the simplest absolute measure of dispersion.
Symbolically : R= L- S
Where R= Represent Range
L= Maximum ( largest ) value and
S= Minimum (smallest ) value
Coefficient or Range
To compare the series the relative measure of dispersion is defined as:
Coefficient of Range (C. R.) = Largest Value - Smallest Value/ Largest Value + Smallest Value = L- S/ L + S