My best/favorite teacher would literally take off the points for a question that the majority of the class got wrong from the total on the test and then hold a lesson on the topic because she realized if 90% of her students didn’t know the answer then she hadn’t done a good job teaching it.
I hate it when teachers take pride in having a large percentage of students get bad grades in their classes. It just means that students aren’t learning from you
I had one professor who outright said that if any question on a test was missed by at least fifty percent of the class, then that was a free point for the whole class, because it represented her failure to present the material. In the course of that class, I think it happened once, and she FOLLOWED THROUGH, repeating herself about the why.
She was ABSOLUTELY one of my favorite professors.