Question

Look at the cumulative frequency distribution table given below:

Monthly income	Number of families
More that Rs 10000	100
More that Rs 14000	85
More that Rs 18000	69
More that Rs 20000	50
More that Rs 25000	37
More that Rs 30000	15

Number of families having income range Rs 20000 to Rs 25000 is
(a) 19
(b) 16
(c) 13
(d) 22

Answer 1

Converting the given data into a frequency table, we get:

Monthly income	No. of families	Frequency
30,000 and Above	15	15
25,000-30,000	37	(37 − 15) = 22
20,000-25,000	50	(50 − 37) = 13
18,000-20,000	69	(69 − 50) = 19
14,000-18,000	85	(85 − 69) = 16
10,000-14,000	100	(100 − 85) = 15

Hence, the number of families having an income range of Rs 20,000-Rs 25,000 is 13.
​The correct option is (c).