#        mass          pdf          cdf
        11.92            0            0
        11.96            0            0
           12            0            0
        12.04            0            0
        12.08            0            0
        12.12            0            0
        12.16            0            0
         12.2            0            0
        12.24            0            0
        12.28            0            0
        12.32            0            0
        12.36            0            0
         12.4           25            1
        12.44            0            1
        12.48            0            1
        12.52            0            1
        12.56            0            1
         12.6            0            1
        12.64            0            1
        12.68            0            1
        12.72            0            1
        12.76            0            1
         12.8            0            1
        12.84            0            1
        12.88            0            1