Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[20,25[	22.5	7	0.083333	0.083333	0.016667
[25,30[	27.5	12	0.142857	0.22619	0.028571
[30,35[	32.5	21	0.25	0.47619	0.05
[35,40[	37.5	36	0.428571	0.904762	0.085714
[40,45]	42.5	8	0.095238	1	0.019048