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Activities like an Assignment or a Quiz may have grades listed in the completed activity itself. You can access these activity scores by clicking on the link to the assignment or quiz inside the course. Below is an example of a score a student might see from a quiz attempt (click the image to enlarge).
Again, the instructor will determine which grades and how students may access them with the settings for the course, and for individual activities. The first contact for questions regarding any grade in your course is the instructor.
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