Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[20,40[	30	1	0.008333	0.008333	0.000417
[40,60[	50	17	0.141667	0.15	0.007083
[60,80[	70	35	0.291667	0.441667	0.014583
[80,100[	90	13	0.108333	0.55	0.005417
[100,120[	110	20	0.166667	0.716667	0.008333
[120,140[	130	21	0.175	0.891667	0.00875
[140,160[	150	9	0.075	0.966667	0.00375
[160,180]	170	4	0.033333	1	0.001667