I believe this is the same issue that I have been working with Miki on troubleshooting. If so, it appears that the teacher modified the value of the questions in the quiz by changing the grade (aka, mark) for the question from 1 to 0 so that some questions were not counted. When changing these, it is necessary to regrade the existing attempts so that the new calculations can take place and the gradebook get updated. I have suggested that a notice be given to the teacher when editing a quiz with existing attempts (watch/vote for MDL-15847). Peace - Anthony
Quiz shows a grade which is differnt from the grade book, please help
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