You can weigh final grades based on the Assignment Groups weights.
In Course Navigation, click the Assignments link.
Click the Settings icon.
Weight Final Grade
Click the Weight final grade based on assignment groups checkbox.
Enter the percentage weights for each of the different Assignment Groups you created. The percentage weights you specify here will determine how Curve calculates the final grade for your course. These percentages can be changed at any time and students will be notified when any changes are made. The weights will show up in the Gradebook for both students and instructors.
Click the Save button once you are finished.