Mathematics
The following table gives the marks scored by a set of students in an examination. Calculate the mean of the distribution by using the short cut method.
| Marks | Number of students (f) |
|---|---|
| 0-10 | 3 |
| 10-20 | 8 |
| 20-30 | 14 |
| 30-40 | 9 |
| 40-50 | 4 |
| 50-60 | 2 |
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