When I was in school there were plenty of tests for which the class average was under 50%. Obviously professors wouldn't try to write them this way, but writing

When I was in school there were plenty of tests for which the class average was under 50%. Obviously professors wouldn't try to write them this way, but writing a test that's hard but not too hard is, well, hard. It frankly was never that big of a deal. Professors would generally curve the test and life would go on. Certainly this doesn't merit a BBC story. If everyone bombed the test, then the professor should obviously consider giving it a healthy curve.