@geoffrey_smith ,
The point values for quizzes are determined by the points assigned to the questions, so when you deleted the questions, it changed the point value for the assignment.
Editing a quiz after it has been delivered does not change what was delivered. This is why the points are all still there for the students.
What you didn't say is what you would like to happen.
If you would like to make the quiz worth 100 points, then you can go in and edit the quiz and add a single question worth 14 points. The students won't see the question since they've already taken the quiz, but the total for the quiz will now be worth 100 points. This is inherently unfair to the students since they're being penalized for questions that they shouldn't have known (assuming the question bank was not from a previous chapter in the course).
If you would like to keep the quiz worth 86 points, then you will need to go in and edit each student's quiz and adjust the scores. You can zero out all of the questions that were bad or you can use assign negative fudge points to adjust the score to be what it should be.
You can automate the process a little to know how many fudge points to use, you can download the student analysis. It will tell you how many points each person got for each question and you can use that to calculate the fudge points. It's not a trivial task, but depending no how many students you have, it may be worth it.
If you need to the exam to be worth 100 percent because of promises you've made regarding assignment group weighting or promises like dropping the lowest exam, then the fairest approach may be a combination of the two approaches to scale their quiz score to be out of 100 points. Add the 14 point question to bring it back to 100 points. Then download the student analysis report and figure out how many of the 86 questions they got right Then divide that by 86 to get the percentage they have correct. Use the fudge points to adjust their grades. Fudge points are assigned when you change a grade in the gradebook, so you don't have to go into SpeedGrader and manually set the fudge points.
If you want to keep it at 86 points but want to be kind to students, then there's one more approach you can use. Just go through the gradebook and for anyone who scored more than 86 points, change it to be worth 86 points. This is beneficial to the students because the questions most likely involved some multiple choice and so they could guess correctly a fraction of the time. That means that you're replacing something they should have known but didn't, with something they could have guessed at and gotten correct. It doesn't measure how much they actually know about the material they were supposed to know, but it's giving them a chance to get a perfect score when they didn't have one before.
In the future, check the exam before the students take it as it's a lot easier to fix at that point.
However, should something like this arises in the future, then use the regrade feature that is available for multiple choice questions. This lesson from the Canvas Instructor Guide explains how: How do I regrade a Multiple Choice quiz question?
The first sentence there says "If you accidentally published a quiz with an existing multiple choice question that needs to be corrected, you can use quiz regrade to edit the question and update student grades." The third bullet point says "Adding or deleting answers from a multiple choice question with submissions disables the option to regrade that question." Hindsight is 20-20, but deleting the questions was one of the worst things you could have done.
There is no "throw out the question" option during a regrade. If there was such an option, it would presumably change the point value as well (perhaps not if these questions were in question groups). If the total points were not reduced, then you could go back and delete the questions to reduce it to 86 points. This is hypothetical since that option doesn't exist.
What you could do if this happens again is "give everyone full credit for this question." That means that everyone has it right so everyone's score is artificially inflated by 14 points. You can leave it like that, but it's not an accurate measure of how much they know. But you could then take their score and subtract 14 and have the number of questions that they had right out of the 86. You could then use that to compute a new percentage for them (score-14)/86*100 and enter that new score in the gradebook. That's something that could be automated using the quiz export/import capabilities and let Excel do the work for you.
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