Answer variants:
19
6
16
30
23
9
Construct a cumulative frequency distribution of less than type for the following data.
| Class interval | Cumulative frequency |
| Less than 20 | 30 |
| Less than 40 | 39 |
| Less than 60 | 45 |
| Less than 80 | 61 |
| Less than 100 | 80 |
| Less than 120 | 103 |
Answer:
| Class interval | Frequency |