A group of geography students investigated local attitudes towards a proposed tidal lagoon energy scheme. They collected survey data from four different residential zones (Sites A-D).
| Residential Zone | Yes (%) | No (%) | Undecided (%) |
|---|---|---|---|
| Site A | 52 | 36 | 12 |
| Site B | 45 | 37 | 18 |
| Site C | 64 | 30 | 6 |
| Site D | 38 | 38 | 24 |
Using Table 1, identify the correct statement below.
The mean percentage for residents who answered 'undecided' was 12%12\%12%.
The mean percentage for residents who answered 'undecided' was 15%15\%15%.
The mean percentage for residents who answered 'undecided' was 18%18\%18%.
The mean percentage for residents who answered 'undecided' was 20%20\%20%.