As part of a physical geography river fieldwork investigation, students measured the soil infiltration rate (in seconds) at four different sites along a transect perpendicular to a river bank.
| Site | Distance from River Bank | Trial 1 Infiltration Time (s) | Trial 2 Infiltration Time (s) | Trial 3 Infiltration Time (s) |
|---|---|---|---|---|
| P | 2m | 27 | 49 | 18 |
| Q | 4m | 38 | 14 | 53 |
| R | 6m | 31 | 74 | 35 |
| S | 8m | 42 | 23 | 61 |
Calculate the median infiltration time for all the measurements taken during this investigation. You should show your workings.
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.