The problem is: this numerical grade causes confusion. So an option to just hide it would be better already.
In a multiple choice quiz there is always a chance that the answer is guessed correctly. You want to adjust the score for that, which makes the 'standard Moodle percentage score' unusable. We use this for example:
In a multiple choice quiz there is always a chance that the answer is guessed correctly. You want to adjust the score for that, which makes the 'standard Moodle percentage score' unusable. We use this for example: