Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[-40,-30[	-35	2	0.022989	0.022989	0.002299
[-30,-20[	-25	0	0	0.022989	0
[-20,-10[	-15	3	0.034483	0.057471	0.003448
[-10,0[	-5	36	0.413793	0.471264	0.041379
[0,10[	5	40	0.45977	0.931034	0.045977
[10,20[	15	5	0.057471	0.988506	0.005747
[20,30[	25	0	0	0.988506	0
[30,40]	35	1	0.011494	1	0.001149