Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[0,5[	2.5	2	0.012821	0.012821	0.002564
[5,10[	7.5	28	0.179487	0.192308	0.035897
[10,15[	12.5	91	0.583333	0.775641	0.116667
[15,20]	17.5	35	0.224359	1	0.044872