Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[15,16[	15.5	13	0.180556	0.180556	0.180556
[16,17[	16.5	32	0.444444	0.625	0.444444
[17,18[	17.5	19	0.263889	0.888889	0.263889
[18,19]	18.5	8	0.111111	1	0.111111