Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[-10,0[	-5	1	0.013333	0.013333	0.001333
[0,10[	5	15	0.2	0.213333	0.02
[10,20[	15	14	0.186667	0.4	0.018667
[20,30[	25	7	0.093333	0.493333	0.009333
[30,40[	35	10	0.133333	0.626667	0.013333
[40,50[	45	7	0.093333	0.72	0.009333
[50,60[	55	8	0.106667	0.826667	0.010667
[60,70[	65	9	0.12	0.946667	0.012
[70,80]	75	4	0.053333	1	0.005333