Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[20,30[	25	1	0.05	0.05	0.005
[30,40[	35	2	0.1	0.15	0.01
[40,50[	45	3	0.15	0.3	0.015
[50,60[	55	3	0.15	0.45	0.015
[60,70[	65	2	0.1	0.55	0.01
[70,80[	75	3	0.15	0.7	0.015
[80,90[	85	4	0.2	0.9	0.02
[90,100]	95	2	0.1	1	0.01