cache_median_question_marks

Purpose: Holds the mean and median performance of a question on a particular paper.

Field	Type	Purpose
paperID	mediumint(8) unsigned	ID of the paper
questionID	int(11) unsigned	ID of the question
median	decimal(10,5)	Median value of students in the cohort.
mean	decimal(10,5)	Mean value of students in the cohort.