Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[15,15.5[	15.25	8	0.133333	0.133333	0.266667
[15.5,16[	15.75	12	0.2	0.333333	0.4
[16,16.5[	16.25	9	0.15	0.483333	0.3
[16.5,17[	16.75	8	0.133333	0.616667	0.266667
[17,17.5[	17.25	8	0.133333	0.75	0.266667
[17.5,18]	17.75	15	0.25	1	0.5