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| sample number | 28 |
|---|---|
| concentration in ppm | |
| mean | 119.72 |
| minimum | 63.76 |
| 1st quartile | 96.86 |
| median | 119.11 |
| 3rd quartile | 141.80 |
| interquartile range | 44.94 |
| maximum | 188.89 |
