Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[-10,-5[	-7.5	7	0.097222	0.097222	0.019444
[-5,0[	-2.5	14	0.194444	0.291667	0.038889
[0,5[	2.5	28	0.388889	0.680556	0.077778
[5,10[	7.5	4	0.055556	0.736111	0.011111
[10,15[	12.5	12	0.166667	0.902778	0.033333
[15,20]	17.5	7	0.097222	1	0.019444