Question

The daily wages of 80 workers in a building project are given below:

Wages(Rs)	No. of workers
30-40	6
40-50	10
50-60	15
60-70	19
70-80	12
80-90	8
90-100	6
100-110	4

Using graph paper, draw an ogive for the above distribution, Use your ogive, to estimate:

(i) the median wages of workers

(ii) the percentage of workers who earn more than Rs. 75 a day

(iii) The upper quartile wage of the workers

(iv) The lower quartile wage of the workers 

(v) Inter quartile range

Answer 1

Through mark 40.5 draw a parallel line to x - axis which meets the curve at A. From A draw a perpendicular  to x - axis meeting it at B.