Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[10,20[	15	1	0.004444	0.004444	0.000444
[20,30[	25	0	0	0.004444	0
[30,40[	35	2	0.008889	0.013333	0.000889
[40,50[	45	2	0.008889	0.022222	0.000889
[50,60[	55	46	0.204444	0.226667	0.020444
[60,70[	65	153	0.68	0.906667	0.068
[70,80]	75	21	0.093333	1	0.009333