Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[140,160[	150	2	0.033333	0.033333	0.001667
[160,180[	170	6	0.1	0.133333	0.005
[180,200[	190	12	0.2	0.333333	0.01
[200,220[	210	10	0.166667	0.5	0.008333
[220,240[	230	13	0.216667	0.716667	0.010833
[240,260[	250	11	0.183333	0.9	0.009167
[260,280[	270	4	0.066667	0.966667	0.003333
[280,300]	290	2	0.033333	1	0.001667