expected        observed
        516.42          533.00
        382.58          356.00
        283.42          305.00
        209.96          189.00
        155.54          165.00
        115.23          130.00
         85.36           81.00
         63.24           50.00
         46.85           48.00
         34.71           29.00

       chi-squared:    12.5438
       probability:     0.2503