Question

The water bills (in rupees) of 32 houses in a certain street for the period 1.1.98 to. 31.3.98 are given below: 

56, 43, 32, 38, 56, 24, 68, 85, 52, 47, 35, 58, 63, 74, 27, 84, 69, 35, 44, 75, 55, 30, 54, 65, 45, 67, 95, 72, 43, 65, 35, 59. 

Tabulate the data and resent the data as a cumulative frequency table using 70-79 as one of the class intervals.

Answer 1

The minimum bill is Rs 24. 

Maximum bill is Rs 95. 

Range = maximum bill – minimum bill 

= 95 - 24

= 71

Given class interval is 70 -79, So class size

 = 79 - 70 = 9

 Number of classes = Range/ class size = 71/9

= 7.88

Number of classes = 8

The cumulative frequency distribution table is as