Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[40,60[	50	2	0.027778	0.027778	0.001389
[60,80[	70	32	0.444444	0.472222	0.022222
[80,100[	90	20	0.277778	0.75	0.013889
[100,120[	110	8	0.111111	0.861111	0.005556
[120,140]	130	10	0.138889	1	0.006944