If you need to enter marks for an offline quiz, the best option is to create an assignment named ‘Quiz X’ with the number of points you are marking the quiz out of. Set Submission type > No submission. This way you can easily enter the marks in the gradebook, which will be available to students once you unmute the assignment (if you have chosen to mute it)

If you create a quiz instead of an assignment, which has no questions and no points, even though you can enter marks in the gradebook, students will receive an error message when trying to see their marks.

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