Question

Find out range and coefficient of range of the following series

$\begin{array}{cccccc}\text{Size}& 5-10& 10-15& 15-20& 20-25& 25-30\\ \text{Frequency}& 4& 9& 15& 30& 40\end{array}$

Answer 1

Range = L - S

Here, L = Largest value, S = Smallest value

$\because$ L = 30, S = 5

$\therefore$ Range = 30 - 5 = 25

Coefficient of Range $=\frac{L-S}{L+S}$

$=\frac{30-5}{30+5}=\frac{25}{35}=0.714$