Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[60,80[	70	21	0.291667	0.291667	0.014583
[80,100[	90	36	0.5	0.791667	0.025
[100,120[	110	13	0.180556	0.972222	0.009028
[120,140]	130	2	0.027778	1	0.001389