Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[420,440[	430	3	0.027523	0.027523	0.001376
[440,460[	450	6	0.055046	0.082569	0.002752
[460,480[	470	13	0.119266	0.201835	0.005963
[480,500[	490	8	0.073394	0.275229	0.00367
[500,520[	510	23	0.211009	0.486239	0.01055
[520,540[	530	10	0.091743	0.577982	0.004587
[540,560[	550	9	0.082569	0.66055	0.004128
[560,580[	570	14	0.12844	0.788991	0.006422
[580,600[	590	13	0.119266	0.908257	0.005963
[600,620[	610	4	0.036697	0.944954	0.001835
[620,640]	630	6	0.055046	1	0.002752