Question

The following distribution gives the daily income of 50 workers of a factory.

Daily income in	100-120	120-140	140-160	160-180	180-200
Number of workers	12	14	8	6	10

Convert the distribution above to a less than type cumulative frequency distribution, and draw its ogive.

Answer 1

Converting given distribution to a less than type cumulative frequency distribution, we have,

Now, let us plot the points corresponding to the ordered pairs (120, l2), (140,26), (160, 34), (180,40), (200, 50) on a graph paper and join them by a freehand smooth curve.

Thus, the obtained curve is called the less than type ogive.