During a survey of a wetland, a student records the number of common rush plants in quadrats at eight positions selected using random coordinates. Each quadrat has an area of 0.5 m2. The recorded counts are shown below.
| Quadrat | Common rush plants counted |
|---|---|
| 1 | 6 |
| 2 | 10 |
| 3 | 8 |
| 4 | 7 |
| 5 | 9 |
| 6 | 11 |
| 7 | 5 |
| 8 | 8 |
The wetland has an area of 84 m2.
Calculate the estimated number of common rush plants in the wetland.
82 exam-style questions on Edexcel GCSE Biology 9.1 Ecosystems and interdependence, covering 9.1.1 Levels of organisation in ecosystems, 9.1.2 Abiotic and biotic factors, 9.1.3 Importance of interdependence, 9.1.4 Parasitism and mutualism, and 9.1.5 Determining number of organisms in an area. Each one has a worked solution and a mark scheme showing where the marks go.