|
|
|
| Standard deviation example: |
||
| scores on a midterm |
||
| interval |
| midpt. |
| 1-5 |
| 3 |
| x 0 |
| = 0 |
| -18.9 |
| 357.21 |
| 0 |
| 6-10 |
| 8 |
| x 1 |
| = 8 |
| -13.9 |
| 193.21 |
| 193.21 |
| 11-15 |
| 13 |
| x 6 |
| = 78 |
| -8.9 |
| 79.21 |
| 475.26 |
| 16-20 |
| 18 |
| x 19 |
| = 342 |
| -3.9 |
| 15.21 |
| 288.99 |
| 21-25 |
| 23 |
| x 33 |
| = 759 |
| 1.1 |
| 1.21 |
| 39.93 |
| 26-30 |
| 28 |
| x 17 |
| = 476 |
| 6.1 |
| 37.21 |
| 632.57 |
| 76 |
| 1663 |
| 1629.96 |