Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[40,60[	50	5	0.041667	0.041667	0.002083
[60,80[	70	40	0.333333	0.375	0.016667
[80,100[	90	20	0.166667	0.541667	0.008333
[100,120[	110	32	0.266667	0.808333	0.013333
[120,140[	130	22	0.183333	0.991667	0.009167
[140,160]	150	1	0.008333	1	0.000417