Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[280,300[	290	8	0.133333	0.133333	0.006667
[300,320[	310	12	0.2	0.333333	0.01
[320,340[	330	10	0.166667	0.5	0.008333
[340,360[	350	5	0.083333	0.583333	0.004167
[360,380[	370	8	0.133333	0.716667	0.006667
[380,400[	390	12	0.2	0.916667	0.01
[400,420]	410	5	0.083333	1	0.004167