Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[460,480[	470	2	0.027397	0.027397	0.00137
[480,500[	490	3	0.041096	0.068493	0.002055
[500,520[	510	9	0.123288	0.191781	0.006164
[520,540[	530	12	0.164384	0.356164	0.008219
[540,560[	550	8	0.109589	0.465753	0.005479
[560,580[	570	13	0.178082	0.643836	0.008904
[580,600[	590	16	0.219178	0.863014	0.010959
[600,620[	610	4	0.054795	0.917808	0.00274
[620,640]	630	6	0.082192	1	0.00411