Question

Use graph paper for this question.

The table given below shows the monthly wages of some factory workers.

1. Using the table, calculate the cumulative frequencies of workers.
2. Draw a cumulative frequency curve.

Use 2 cm = ₹ 500, starting the origin at ₹ 6500 on x-axis, and 2 cm = 10 workers on the y-axis. 

Wages (in ₹.)	6500-7000	7000-7500	7500-8000	8000-8500	8500-9000	9000-9500	9500-10000
No. of workers	10	18	22	25	17	10	8

Answer 1

i.

Wages	No. of workers	c.f.
6500-7000	10	10
7000-7500	18	28
7500-8000	22	50
8000-8500	25	75
8500-9000	17	92
9000-9500	10	102
9500-10000	8	110

Total = 110
ii.
Now plot the points (7000, 10), (7500, 28), (8000, 50), (8500, 75), (9000, 92), (9500, 102) and (10000, 110) and join them to obtain an ogive.