Frequency Table (Histogram)
Bins	Midpoint	Abs. Frequency	Rel. Frequency	Cumul. Rel. Freq.	Density
[40,60[	50	3	0.041667	0.041667	0.002083
[60,80[	70	7	0.097222	0.138889	0.004861
[80,100[	90	22	0.305556	0.444444	0.015278
[100,120[	110	12	0.166667	0.611111	0.008333
[120,140[	130	24	0.333333	0.944444	0.016667
[140,160]	150	4	0.055556	1	0.002778