Mathematics
If the mean of the following observations is 54, find the value of p.
| Class | Frequency |
|---|---|
| 0 - 20 | 7 |
| 20 - 40 | p |
| 40 - 60 | 10 |
| 60 - 80 | 9 |
| 80 - 100 | 13 |
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Using the information given in the adjoining histogram; calculate the mean.
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