An offline assignment or a designated grade item in the gradebook. Both are graded manually, the former either in the activity or in the gradebook and the latter in the gradebook. Students will see in their grade report one entry for the MC quiz and another for the graphing. If the response graph will not appear in the quiz review (if you don't scan and upload it to the grade comment) I don't see any particular benefit for having its evaluation in the quiz.
Quiz
Suggestions as to the best way to implement this Quiz
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