Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[17,18[	17.5	12	0.2	0.2	0.2
[18,19[	18.5	17	0.283333	0.483333	0.283333
[19,20[	19.5	21	0.35	0.833333	0.35
[20,21[	20.5	9	0.15	0.983333	0.15
[21,22]	21.5	1	0.016667	1	0.016667