Calculate the standard deviation from the formula
The table shows the distance, in kilometres, travelled to work by four employees at a company, with the working for the standard deviation partly filled in
| Distance (km) | Deviation | Squared deviation |
|---|---|---|
| 12 | -3 | 9 |
| 16 | 1 | 1 |
| 16 | 1 | 1 |
| 16 | 1 | 1 |