Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[10,20[	15	1	0.090909	0.090909	0.009091
[20,30[	25	0	0	0.090909	0
[30,40[	35	4	0.363636	0.454545	0.036364
[40,50[	45	3	0.272727	0.727273	0.027273
[50,60[	55	2	0.181818	0.909091	0.018182
[60,70]	65	1	0.090909	1	0.009091