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Question
The following frequency distribution gives the monthly consumption of electricity of 64 consumers of locality.
| Monthly consumption (in units) |
65 – 85 |
85 – 105 |
105 – 125 |
125 – 145 |
145 – 165 |
165 – 185 |
| Number of consumers |
4 | 5 | 13 | 20 | 14 | 8 |
Form a ‘ more than type’ cumulative frequency distribution.
Sum
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Solution
The cumulative frequency distribution table of more than type is as follows:
| Monthly consumption (in units) (lower class limits) |
Cumulative frequency (𝑐𝑓) |
| More than 65 | 60 + 4 =64 |
| More than 85 | 55 + 5 = 60 |
| More than 105 | 42 + 13 = 55 |
| More than 125 | 22 + 20 = 42 |
| More than 145 | 8 + 14 = 22 |
| More than 165 | 8 |
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