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Directions: Following is the table for the results of the heights of some plants which were grown in laboratory and recorded after 30 days (in mm)
| Height (in mm) | Frequency |
| 200 - 210 | 2 |
| 210 - 220 | 3 |
| 220 - 230 | 1 |
| 230 - 240 | 5 |
| 240 - 250 | 7 |
What is cumulative frequency for first class?
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