Question

From the following data of the ages of different persons, prepare less than and more than cumulative frequency distribution.

Age (in years)	10−20	20−30	30−40	40−50	50−60	60−70	70−80
No. of Persons	5	12	10	6	4	11	2

Answer 1

Age (in years)	No. of Persons
10 − 20 20 − 30 30 − 40 40 − 50 50 − 60 60 − 70 70 − 80	5 12 10 6 4 11 2
	$\sum _{}f=50$

Less than frequency distribution

Age	Cumulative frequency
Less than 20 Less than 30 Less than 40 Less than 50 Less than 60 Less than 70 Less than 80	5 5 + 12 = 17 17 + 10 = 27 27 + 6 = 33 33 + 4 = 37 37 + 11 = 48 48 + 2 = 50

More than frequency distribution

Age	Cumulative frequency
More than 10 More than 20 More than 30 More than 40 More than 50 More than 60 More than 70	50 50 − 5 = 45 45 − 12 = 33 33 − 10 = 23 23 − 6 = 17 17 − 4 = 13 13 − 11 = 2