| Grade | % | z-score |
| A | 88 | 80 |
| B | 78 | 63 |
| C | 69 | 43 |
| D | 59 | 30 |
| F | below 58 | 29 or below |
Please note that the curve is approximate and can change slightly as students drop the class. Also note that the percentage-based curve is there simply to indicate where your grade would be if I used strict-percentage curve.


r2 = 0.42, so that 42 percent of the variation in exam one score is predicted by homework scores.