A median is specifically a method of taking an average that always results in half above and half below. Take the total number of participants, divide it by two, then count that number from either end. The middle is the median. It’s a more accurate form of averages for statistical analysis.

Mean is where you add all of the scores and divide by the total number of participants. It’s more liable to be skewed by outliers, so not necessarily in the dead center of the list. It’s often avoided in statistical analysis for that reason.

Edit: I just reread your comment and on second glance it seems we’re saying the same thing. I should have replied to the commenter below you…