Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[0,20[	10	4	0.033333	0.033333	0.001667
[20,40[	30	29	0.241667	0.275	0.012083
[40,60[	50	25	0.208333	0.483333	0.010417
[60,80[	70	15	0.125	0.608333	0.00625
[80,100[	90	23	0.191667	0.8	0.009583
[100,120[	110	20	0.166667	0.966667	0.008333
[120,140]	130	4	0.033333	1	0.001667