Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[30,40[	35	1	0.027778	0.027778	0.002778
[40,50[	45	3	0.083333	0.111111	0.008333
[50,60[	55	5	0.138889	0.25	0.013889
[60,70[	65	11	0.305556	0.555556	0.030556
[70,80[	75	12	0.333333	0.888889	0.033333
[80,90]	85	4	0.111111	1	0.011111