Question

The following cumulative frequency distribution table shows the daily electricity consumption (in KW) of 40 factories in an industrial state:

Consumption (in KW)	No. of Factories
Below 240 Below 270 Below 300 Below 330 Below 360 Below 390 Below 420	1 4 8 24 33 38 40

(i) Represent this as a frequency distribution table.
(ii) Prepare a cumulative frequency table.

Answer 1

We make class intervals 0-240, 240-270, 270-300, 300-330, 330-360, 360-390 and 390-420.

(i) We will now find the frequencies of the different class-intervals.

Just proceed reverse to you proceed to generate cumulative frequency

Here is the frequency distribution table.

(ii) We are given the cumulative frequency table and we are asked to prepare new one.

So we will generate in some other fashion. Concentrate on frequency table and prepare the table. Here is the cumulative frequency distribution table.