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	10	0.136986	0.205479	0.006849
[520,540[	530	18	0.246575	0.452055	0.012329
[540,560[	550	16	0.219178	0.671233	0.010959
[560,580[	570	13	0.178082	0.849315	0.008904
[580,600[	590	9	0.123288	0.972603	0.006164
[600,620]	610	2	0.027397	1	0.00137