Question

Calculate quartile deviation and its relative measure from the following data:

X	0-10	10-20	20-30	30-40	40-50	50-60
f	5	10	13	18	14	8

Answer 1

Thus Q₁ lies in the class 20 – 30 and corresponding values are L = 20, \(\frac{N}{4}\) = 17, pcf = 15, f = 13, C = 10.

Thus Q₃ lies in the class 40 – 50 and corresponding values are L = 40, \(\frac{3N}{4}\) = 51, pcf = 46, f = 14, C = 10

Relative measure, coefficient of QD