Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[11,12[	11.5	3	0.017751	0.017751	0.018182
[12,13[	12.5	5	0.029586	0.047337	0.030303
[13,14[	13.5	16	0.094675	0.142012	0.09697
[14,15[	14.5	13	0.076923	0.218935	0.078788
[15,16[	15.5	40	0.236686	0.455621	0.242424
[16,17[	16.5	44	0.260355	0.715976	0.266667
[17,18[	17.5	32	0.189349	0.905325	0.193939
[18,19[	18.5	8	0.047337	0.952663	0.048485
[19,20]	19.5	4	0.023669	0.976331	0.024242