Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[6.5,7[	6.75	21	0.25	0.25	0.5
[7,7.5[	7.25	18	0.214286	0.464286	0.428571
[7.5,8[	7.75	23	0.27381	0.738095	0.547619
[8,8.5]	8.25	22	0.261905	1	0.52381