Find out the range and the coefficient of range of the following series:

Explanation

This is an inclusive series. For the estimation of range, this must be converted into exclusive series, as below:

L=19.5, H=69.5
Coefficient of Range(CR)`=(69.5-19.5)/(69.5+19.5)`
`=(50)/(89)`
=0.562
Range =50
Coefficient of Range=0.562.