An ecologist wants to estimate the population of marsh orchid spikes in a 650 m2 conservation meadow. They use a 1 m2 quadrat to sample six random locations within the meadow. The table below shows the number of marsh orchid spikes and their mean height across the six sampled quadrats.
| Quadrat sample | Number of marsh orchid spikes | Mean height of orchid spikes / cm |
|---|---|---|
| 1 | 23 | 34 |
| 2 | 14 | 28 |
| 3 | 29 | 41 |
| 4 | 17 | 30 |
| 5 | 21 | 35 |
| 6 | 22 | 36 |
Calculate the mean number of marsh orchid spikes per quadrat for these six samples.
