Not possible, at least not now.
(There are a bunch of requirements around more complex ways to compute the final grade for a quiz, and it would be nice to have a way to start covering them, but I don't currently have a good idea for how to do that.)
(There are a bunch of requirements around more complex ways to compute the final grade for a quiz, and it would be nice to have a way to start covering them, but I don't currently have a good idea for how to do that.)