Random questions are a special question type.
When you put a Random Question into a quiz, then a question will be chosen randomly from the whole category, on each attempt.
The maximum grade for the question will always be when you have chosen as the grade for the Random Question.
If you make a quiz with, say, 10 random questions, then each student may get a completely different set of 10 questions each time they attempt the quiz.
Note that you can mix random and non-random questions if you want to ensure that particular questions are always included.
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