Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[10,15[	12.5	1	0.016667	0.016667	0.003333
[15,20[	17.5	8	0.133333	0.15	0.026667
[20,25[	22.5	17	0.283333	0.433333	0.056667
[25,30[	27.5	19	0.316667	0.75	0.063333
[30,35[	32.5	14	0.233333	0.983333	0.046667
[35,40]	37.5	1	0.016667	1	0.003333