The following cumulative frequency distribution table shows the daily electricity consumption (in KV) of 40 factories in an industrial state:
Consumption (in KV) | 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.
Consumption (Kw) | No. of factories | Class interval | Frequency |
Below 240 | 1 | 0-240 | 1 |
Below 270 | 4 | 240-270 | 3 |
Below 300 | 8 | 270-300 | 4 |
Below 330 | 24 | 300-330 | 16 |
Below 360 | 33 | 330-360 | 9 |
Below 390 | 38 | 360-390 | 5 |
Below 420 | 40 | 390-420 | 2 |
(ii)
Class interval | Frequency | Consumption (in Kw) | No. of factories |
0-240 | 1 | More than 0 | 40 |
240-270 | 3 | More than 240 | 39 |
270-300 | 4 | More than 270 | 36 |
300-330 | 16 | More than 300 | 32 |
330-360 | 9 | More than 330 | 16 |
360-390 | 5 | More than 360 | 7 |
390-420 | 2 | More than 390 | 2 |
More than 420 | 0 | ||
N = 40 |