Task menu reference
Task|Colour quartiles
The Colour quartiles commands sets the colour of the the cells of the current task based on the quartile of each student result. The quartiles are coloured from highest to lowest in order in shads of green, blue, yellow, red.
If there are several students with the same result that is equal to the dividing mark for a quartile, the number of students in each quartile will not necessarily be equal. This command intended for a quick representation, while the Quartiles calculation in the Edit|Calculation command can be used for a more precise set of quartiles.