A group of geography students investigated urban environmental quality across eight different sites in a city center. They recorded a 'Litter Density Score' (out of 30) at each site. Their results are shown in the table below:
| Site | Litter Density Score |
|---|---|
| Site A | 15 |
| Site B | 8 |
| Site C | 23 |
| Site D | 11 |
| Site E | 4 |
| Site F | 19 |
| Site G | 12 |
| Site H | 7 |
Calculate the median Litter Density Score. Write your answer to one decimal place. Show all your workings.
