1 answer
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| Interval | Frequency |
|-------------|-----------|
| 0-4 | 1 |
| 5-9 | 2 |
| 10-14 | 1 |
| 15-19 | 3 |
Total conversations = 6 + 4 + 15 + 8 + 17 + 18 + 9 = 77 conversations.