Question health

For improving the questions, across all your groups. A question is only judged once it has 30 answers.

Option not working: a wrong option chosen in under 5% of answers. It isn't drawing out a misconception; replace it.
Too easy: more than 90% correct.
Poor discrimination: the strongest third of students do barely better than the weakest third. It may be ambiguous.
High "I don't know": over 40%. Unclear, or the topic needs re-teaching.

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