Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[-25,-20[	-22.5	5	0.061728	0.061728	0.012346
[-20,-15[	-17.5	6	0.074074	0.135802	0.014815
[-15,-10[	-12.5	14	0.17284	0.308642	0.034568
[-10,-5[	-7.5	20	0.246914	0.555556	0.049383
[-5,0[	-2.5	29	0.358025	0.91358	0.071605
[0,5]	2.5	7	0.08642	1	0.017284