Mathematics
Using step-deviation method, find mean for the following frequency distribution
| Class | Frequency |
|---|---|
| 0-15 | 3 |
| 15-30 | 4 |
| 30-45 | 7 |
| 45-60 | 6 |
| 60-75 | 8 |
| 75-90 | 2 |
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