Question

Prepare a less than ogive from the following data:

Class	:	0-6	6-12	12-18	18-24	24-30	30-36
Frequency	:	4	8	15	20	12	6

Answer 1

In order to prepare a less than ogive, we first need to calculate the less than cumulative frequency distribution as follows:

Class	Cumulative Frequency
Less than 6 Less than 12 Less than 18 Less than 24 Less than 30 Less than 36	4 4 + 8 = 12 12 + 15 = 27 27 + 20 = 47 47 + 12 = 59 59 + 6 = 65

We now plot the cumulative frequencies against the upper limit of the class intervals. The curve obtained on joining the points so plotted is known as the less than ogive.