Purpose: Holds statistics of the performance of a paper. Used in the Performance Summary reports.

Field	Type	Purpose
paperID	mediumint(8) unsigned	ID of the paper
cached	int(10) unsigned	Unix timestamp when the data was cached.
max_mark	decimal(10,5)	Maximum student mark on the paper.
max_percent	decimal(10,5)	Maximum student percentage on the paper.
min_mark	decimal(10,5)	Minimum student mark on the paper.
min_percent	decimal(10,5)	Minimum student percentage on the paper.
q1	decimal(10,5)	Quartile 1 percentage.
q2	decimal(10,5)	Quartile 2 percentage.
q3	decimal(10,5)	Quartile 3 percentage.
mean_mark	decimal(10,5)	Mean student mark on the paper.
mean_percent	decimal(10,5)	Mean student percentage on the paper.
stdev_mark	decimal(10,5)	Standard deviation mark.
stdev_percent	decimal(10,5)	Standard deviation percentage.

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