Construct a cumulative distribution of less than type for the following data.
| Class interval | Cumulative frequency |
| More than or equal to 20 | 67 |
| More than or equal to 40 | 51 |
| More than or equal to 60 | 43 |
| More than or equal to 80 | 28 |
| More than or equal to 100 | 19 |
| More than or equal to 120 | 18 |
Answer:
| Class interval | Cumulative Frequency |
| less than 40 | |
| less than 60 | |
| less than 80 | |
| less than 100 | |
| less than 120 | |
| less than 140 |