When you create an assignment you have the option to choose how the grades if that assignment should be displayed, like this:
But is there an equivalent for blogs that you choose to grade? I don't see anywhere in the create/edit blog where one could choose how to display grades given for blogs.
As you might or might not be aware, Sweden uses letter grades and those grades are not intended to be based on any numerical value (ie. it's not possible to say that X % is A, Y % is a B or getting an A is Z% better than the getting a B). Therefore we wish to hide as much as possible of Blackboards annoying need to base all grading on numerical values.