This setting specifies the minimum number of questions that will be used to calculate a grade for the activity. If the lesson contains one or more content pages, the minimum number of questions should be set to zero.

If set to say 20, it is suggested that the following text is added to the opening page of the lesson: "In this lesson you are expected to attempt at least 20 questions. You can attempt more if you wish. However, if you attempt less than 20 questions, your grade will be calculated as though you attempted 20."