Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[0,20[	10	6	0.166667	0.166667	0.008333
[20,40[	30	10	0.277778	0.444444	0.013889
[40,60[	50	0	0	0.444444	0
[60,80[	70	5	0.138889	0.583333	0.006944
[80,100[	90	4	0.111111	0.694444	0.005556
[100,120[	110	5	0.138889	0.833333	0.006944
[120,140[	130	0	0	0.833333	0
[140,160]	150	6	0.166667	1	0.008333