Mathematics
If the mean of the following observations is 16.6, find the numerical value of p.
| Variate (xi) | Frequency (fi) |
|---|---|
| 8 | 12 |
| 12 | 16 |
| 15 | 20 |
| 18 | p |
| 20 | 16 |
| 25 | 8 |
| 30 | 4 |
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