I'm a non-specialist teaching S1. My students know how to find Q1, median and Q3 but love bombarding me with the same question over and over again about why we round UP if we have a non-integer value of n/4 etc. (e.g. if n is 9, we round 2.25 up to find the 3rd data point for Q1). I know some of the students just love asking the question because they think they sound cleverer than me "so I always round 2.2 up to 3 then Miss" (in a sarcastic tone) etc. However, I know that some are genuinely confused. (There are some weak students in the group). Any ideas? Thanks!