Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[30,40[	35	2	0.04	0.04	0.004
[40,50[	45	4	0.08	0.12	0.008
[50,60[	55	10	0.2	0.32	0.02
[60,70[	65	13	0.26	0.58	0.026
[70,80[	75	12	0.24	0.82	0.024
[80,90]	85	9	0.18	1	0.018