Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[-80,-60[	-70	11	0.130952	0.130952	0.006548
[-60,-40[	-50	12	0.142857	0.27381	0.007143
[-40,-20[	-30	26	0.309524	0.583333	0.015476
[-20,0[	-10	34	0.404762	0.988095	0.020238
[0,20]	10	1	0.011905	1	0.000595