I would add that your course is using a weighted gradebook. That means that not every category counts the same.
Your grades page should contain a block that shows the weighting. It may look something like this (except have your course weights instead of mine).
To calculate your grade, you multiply the percentage for each category by it's weight. Ignore any categories that don't have grades in them. Then you divide that by the sum of the weights for the categories that are used. If the sum of the weights is more than 100%, then just divide by 100% and there is an opportunity for extra credit.
These numbers aren't your weights, but they will give an example of how to compute your grade. Let's say the teacher has these weights and you have the scores.
| Group | Weight | Score |
| Assignments | 0% | |
| Checkpoint | 5% | 100% |
| Discussion | 10% | 0% |
| Exam | 50% | 70% |
| Final Exam | 20% | |
| Project | 10% | |
| Workbook | 5% | 100% |
| Total | 100% | 64.29% |
Here's how you come up with the 64.29%.
You only use checkpoint, discussion, exam, and workbook since those are the only ones with grades in them.
You have 100% of 5 points, 0% of 10 points, 70% of 50 points, and 100% of 5 points. That is 1.00*5 +0.00*10+0.70*50+1.00*5 = 45
The sum of the weights for the used assignment groups are 5+10+50+5=70.
When you take 45/70, you get 64.28571429, which is where I got the 64.29% from.
The number of points in each assignment group (500, 100, 100, 1500) have nothing to do directly with the actual calculations, it's the percentages that are used. Indirectly, the percentage is determined by taking your points of an assignment group divided by the possible points so far for that assignment group.
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