Excuse me , Professor . I think there might be an error in my test score .   Sure . Do you think that the total is wrong or that you got something marked wrong that should have been marked right ?   I think that the percentage is incorrect .   Let's just go over all of it to double-check .   Sure , let's do it .   Here is the answer sheet . Do you see a place where I marked something wrong that should have been right ?   I don't see any mistakes .   OK , now that we've gotten those straightened out , let's total the score .   Yes , let's total it .   Well , if I total that like this and divide by this number , I get this total . Do you agree ?   Yes , you're right .   Well then , we are all straight . Have a good day and thanks for bringing that to my attention . 