Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[0,20]	10	355	0.394444	0.394444	0.019722
]20,40]	30	528	0.586667	0.981111	0.029333
]40,60]	50	16	0.017778	0.998889	0.000889
]60,80]	70	1	0.001111	1	5.6e-05