Construct a cumulative frequency distribution of less than type for the following data.
| Class interval | Frequency |
| Below 20 | 17 |
| 20 \(-\) 30 | 1 |
| 30 \(-\) 40 | 10 |
| 40 \(-\) 50 | 17 |
| 50 \(-\) 60 | 6 |
| 60 \(-\) 70 | 6 |
Answer:
| Class interval | Cumulative frequency |
| \(\text{Less than }\)\(20\) | |
| \(\text{Less than }\)\(30\) | |
| \(\text{Less than }\)\(40\) | |
| \(\text{Less than }\)\(50\) | |
| \(\text{Less than }\)\(60\) | |
| \(\text{Less than }\)\(70\) |