Calculate the standard deviation from the formula
The table shows the typing speed, in words per minute, of three students in a typing test, with the working for the standard deviation partly filled in
| Typing speed (wpm) | Deviation | Squared deviation |
|---|---|---|
| 37 | 5 | 25 |
| 27 | -5 | 25 |
| 32 | 0 | 0 |