Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[-25,-20[	-22.5	2	0.027397	0.027397	0.005479
[-20,-15[	-17.5	14	0.191781	0.219178	0.038356
[-15,-10[	-12.5	5	0.068493	0.287671	0.013699
[-10,-5[	-7.5	10	0.136986	0.424658	0.027397
[-5,0[	-2.5	9	0.123288	0.547945	0.024658
[0,5[	2.5	8	0.109589	0.657534	0.021918
[5,10[	7.5	6	0.082192	0.739726	0.016438
[10,15[	12.5	12	0.164384	0.90411	0.032877
[15,20[	17.5	2	0.027397	0.931507	0.005479
[20,25[	22.5	2	0.027397	0.958904	0.005479
[25,30]	27.5	3	0.041096	1	0.008219