Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[-25,-20[	-22.5	7	0.097222	0.097222	0.019444
[-20,-15[	-17.5	13	0.180556	0.277778	0.036111
[-15,-10[	-12.5	20	0.277778	0.555556	0.055556
[-10,-5[	-7.5	17	0.236111	0.791667	0.047222
[-5,0[	-2.5	12	0.166667	0.958333	0.033333
[0,5]	2.5	3	0.041667	1	0.008333