As part of a physical geography field trip, a group of students measured the maximum clast diameter of river bedload at 11 sampling sites along a downstream transect of a headwater stream. Their measurements are recorded in the table below.
| Sampling Site | Maximum clast diameter (mm) |
|---|---|
| Site 1 | 112 |
| Site 2 | 45 |
| Site 3 | 185 |
| Site 4 | 92 |
| Site 5 | 138 |
| Site 6 | 220 |
| Site 7 | 74 |
| Site 8 | 162 |
| Site 9 | 28 |
| Site 10 | 205 |
| Site 11 | 58 |
Calculate the upper quartile value of this dataset. You must show your working out.
87 exam-style questions on OCR A GCSE Geography Numerical and statistical skills. Each one has a worked solution and a mark scheme showing where the marks go.