An engineering student is testing a new electromagnetic braking system on a scale-model rail car. The car is launched at a constant initial speed along a level track, and its braking distance is recorded. Table 1 shows the results for five test runs at this speed.
Table 1
| Run | Braking distance (cm) |
|---|---|
| 1 | 18.4 |
| 2 | 19.1 |
| 3 | 34.2 |
| 4 | 18.1 |
| 5 | 18.8 |
Use the results in Table 1 to calculate the mean braking distance.