Question

Find range, coefficient of range, quartile deviation, coefficient of quartile deviation, mean deviation and coefficient of mean deviation from the following data of number of emergency visits of 80 doctors to their patients in a town:

No. of visits	3	5	8	12	17	20	24	30	35
No. of doctors	1	3	7	15	20	13	10	7	4

Answer 1

Range:
x_H = 35. x_L = 3
Here, R = X_H – X_L
= 35 – 3 = 32 visits

First quartile:
Q₁ = Value of (\(\frac{n+1}{4}\))th observation
= Value of (\(\frac{80+1}{4}\))th observation
= Value of 20.25 th observation

Referring to column cf Q₁ = 12