The water bills (in rupees) of 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 present the data as a cumulative frequency table using 70-79 as one of the class intervals.

The minimum bill is Rupees 24


And, the maximum bill is Rupees 95


Range = Maximum bill – Minimum bill


= 95 – 24 = 71


Given, class interval is 70-79. So, class size = 79 – 70


= 9


Therefore, Number of classes = =


= 7.80 = 8


The cumulative frequency distribution table is as follows:


Bills



No. of houses (Frequency)



Cumulative frequency



16-25



1



1



25-34



3



4



34-43



5



9



43-52



4



13



52-61



7



20



61-70



6



26



70-79



3



29



79-88



2



31



88-97



1



32



5