Mathematics
The mean age of a group of 40 students is 17.45 years. Find the missing frequencies.
| Age (in years) | Number of students |
|---|---|
| 15 | 3 |
| 16 | ? |
| 17 | 9 |
| 18 | 11 |
| 19 | ? |
| 20 | 3 |
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