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If you weight various items or categories by  particular percentages of the overall course grade, use the Weighted mean of grades aggregation type. After selecting this type, a weight column will appear where users may assign percentages to items or categories, i.e. Exam 1 is 25%.

From the main course page, select Gradebook setup from the gear icon.Step-by-step guide

1. 
   
   
   
2. In the Actions column for the Course, click the Edit menu > Edit settings link.
   
   
   
   
3. Toggle or confirm that Aggregation is set to Weighted mean of grades.
   
   
4. Click Save changes at the bottom of the screen and the Weight fields for entering percentages will display in the Weight column for any grade items.
   
   
5. Enter the weights for the categories or grade items as a percentage (e.g., 15 for 15%) , and click Save changes at the bottom of the screen.