Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[10,20[	15	34	0.472222	0.472222	0.047222
[20,30[	25	18	0.25	0.722222	0.025
[30,40[	35	17	0.236111	0.958333	0.023611
[40,50]	45	3	0.041667	1	0.004167