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Answer variants:
18
19
23
28
9
3
Construct a cumulative frequency distribution of less than type for the following data.
| Class interval | Cumulative frequency |
| Less than 15 | 28 |
| Less than 30 | 37 |
| Less than 45 | 40 |
| Less than 60 | 58 |
| Less than 75 | 77 |
| Less than 90 | 100 |
Answer:
| Class interval | Frequency |
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