Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[40,60[	50	4	0.055556	0.055556	0.002778
[60,80[	70	13	0.180556	0.236111	0.009028
[80,100[	90	26	0.361111	0.597222	0.018056
[100,120[	110	11	0.152778	0.75	0.007639
[120,140[	130	13	0.180556	0.930556	0.009028
[140,160[	150	3	0.041667	0.972222	0.002083
[160,180]	170	2	0.027778	1	0.001389