| Class | Frequency |
| 5-10 | 5 |
| 10-15 | 6 |
| 15-20 | 15 |
| 20-25 | 10 |
| 25-30 | 5 |
| 30-35 | 4 |
| 35-40 | 2 |
| 40-45 | 2 |
Answer:
19.50
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