A group of students investigated reaction times using the ruler-drop test. They compared the catch distance of their dominant hand against their non-dominant hand.
The table below shows their results.
| Hand | Trial 1 distance (cm) | Trial 2 distance (cm) | Trial 3 distance (cm) | Trial 4 distance (cm) | Trial 5 distance (cm) | Mean distance (cm) |
|---|---|---|---|---|---|---|
| Dominant | 12.1 | 14.3 | 11.5 | 13.8 | 12.9 | 13 |
| Non-dominant | 16.2 | 19.5 | 17.3 | 18.8 | 20.1 | ? |
Calculate the mean distance dropped for the non-dominant hand. Give your answer correct to 2 significant figures.