Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[40,60[	50	6	0.083333	0.083333	0.004167
[60,80[	70	5	0.069444	0.152778	0.003472
[80,100[	90	18	0.25	0.402778	0.0125
[100,120[	110	17	0.236111	0.638889	0.011806
[120,140[	130	13	0.180556	0.819444	0.009028
[140,160[	150	8	0.111111	0.930556	0.005556
[160,180[	170	5	0.069444	1	0.003472