Mathematics
The following table shows a record of the weights, in kilogram, of 100 pupil. Find the mean weight.
| Weight | Number of pupils |
|---|---|
| 50-53 | 15 |
| 53-56 | 18 |
| 56-59 | 20 |
| 59-62 | 25 |
| 62-65 | 16 |
| 65-68 | 6 |
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