Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[15,20[	17.5	22	0.366667	0.366667	0.073333
[20,25[	22.5	14	0.233333	0.6	0.046667
[25,30[	27.5	4	0.066667	0.666667	0.013333
[30,35[	32.5	14	0.233333	0.9	0.046667
[35,40[	37.5	3	0.05	0.95	0.01
[40,45]	42.5	3	0.05	1	0.01