HOw to calculate a formula grade item.

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The instructor has 8 single-question quizzes and one Question Pool quiz. They would like the grade book to calculate the first 5 the student completes as part of the grade.

The grade book is weighted - this will fall into a category that carries 5% of the Final grade weight.

Thoughts on how to handle this? I am thinking of the formula grade item but I do not see how to assign it to the category and the question pool quiz is throwing an error.