What do you do when an entire cohort fails? Bump the grades? That is what has happened in every low scoring class I have been in, but that hardly addresses what

What do you do when an entire cohort fails? Bump the grades? That is what has happened in every low scoring class I have been in, but that hardly addresses whatever the core problem is. Should it be an expectation that 30% of students will always get an A and only 5% will fail, no matter what? That being said, I am amazed they fired someone so high profile.