Chapter 7:  Intervals and frequencies for the 95 width
measurements.

Col 1: Interval
Col 2: Midpoint
Col 3: Freq
Col 4: Rel Freq
Col 5: RelCum Freq
            
         [3.9675, 3.9725)     3.970    2    0.021    0.021   
         [3.9725, 3.9775)     3.975    0    0.0      0.021
         [3.9775, 3.9825)     3.980    0    0.0      0.021
         [3.9825, 3.9875)     3.985    7    0.074    0.095   
         [3.9875, 3.9925)     3.990   33    0.347    0.442 
         [3.9925, 3.9975)     3.995   23    0.242    0.684 
         [3.9975, 4.0025)     4.000   15    0.158    0.842   
         [4.0025, 4.0075)     4.005    9    0.095    0.937  
         [4.0075, 4.0125)     4.010    5    0.053    0.999   
         [4.0125, 4.0175)     4.015    0    0.000    0.990  
         [4.0175, 4.0225)     4.020    1    0.010    1.000