Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[460,480[	470	2	0.030769	0.030769	0.001538
[480,500[	490	3	0.046154	0.076923	0.002308
[500,520[	510	9	0.138462	0.215385	0.006923
[520,540[	530	11	0.169231	0.384615	0.008462
[540,560[	550	5	0.076923	0.461538	0.003846
[560,580[	570	10	0.153846	0.615385	0.007692
[580,600[	590	15	0.230769	0.846154	0.011538
[600,620[	610	4	0.061538	0.907692	0.003077
[620,640]	630	6	0.092308	1	0.004615