Mathematics
A class teacher has the following absentee record of 40 students of a class for the whole term. Find the mean number of days a student was absent.
| No. of days | No. of students |
|---|---|
| 0 - 6 | 11 |
| 6 - 10 | 10 |
| 10 - 14 | 7 |
| 14 - 20 | 4 |
| 20 - 28 | 4 |
| 28 - 38 | 3 |
| 38 - 40 | 1 |
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