- Create a quiz with, say, 3 questions each worth 0.1 points
- Create a gradebook category that uses at least one of the drop highest / drop lowest / keep highest features
- Create an item in that gradebook category worth 0.3 points
- Edit the quiz's gradebook item, adding it to that category
The point value doesn't match the existing items, so you get a feedback message indicating the point value doesn't match the maximum of 0.3. Cause we all know that
0.1 + 0.1 + 0.1 = 0.30000000000000004
it's basic arithmetic!
Solution - when calculating the total point value of a quiz, use BigDecimal