How can I regrade a quiz with attached question banks

fritzs
Community Explorer

After completing a quiz with question banks, I noticed an error in one of the answers . . . actually a student did.  When I go back to the question bank and change the answer, it does not regrade the quiz.  How can I make this happen.  PS I have 250 students and really don't want to have to go into speed grader for every kid and regrade manually.  Please tell me there is a way to do this.