Here are all of the classes we will use for this example. A convenient way to list the intervals is to place the lowest values at the top and the highest values at the bottom.
| Intervals |
| 65 - 70 |
| 70 - 75 |
| 75 - 80 |
| 80 - 85 |
| 85 - 90 |
| 90 - 95 |
| 95 - 100 |
| 100 - 105 |
| 105 - 110 |
| 110 - 115 |
