Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[0,20[	10	1	0.008333	0.008333	0.000417
[20,40[	30	21	0.175	0.183333	0.00875
[40,60[	50	28	0.233333	0.416667	0.011667
[60,80[	70	13	0.108333	0.525	0.005417
[80,100[	90	4	0.033333	0.558333	0.001667
[100,120[	110	8	0.066667	0.625	0.003333
[120,140[	130	10	0.083333	0.708333	0.004167
[140,160[	150	9	0.075	0.783333	0.00375
[160,180[	170	13	0.108333	0.891667	0.005417
[180,200[	190	8	0.066667	0.958333	0.003333
[200,220]	210	5	0.041667	1	0.002083