Q:   Estimate the uncertainty in the distance modulus to the LMC,
             using the standard deviation from the mean of these values.

                  (m-M)  =  18.490   +/-  0.016


  Q:   Use the mean distance modulus to determine a distance to the LMC in kpc.

                            (18.490 + 5) / 5
                    d  =  10

                       =  49.88  kpc
 

  Q:   Use the maximum distance modulus (mean + uncert) to determine a
            maximum distance estimate.

                            (18.506 + 5) / 5
               max  d  =  10

                       =  50.26  kpc
 


  Q:   Use the minimum distance modulus (mean - uncert) to determine a
            minimum distance estimate.


                            (18.474 + 5) / 5
               min  d  =  10

                       =  49.52  kpc
 


  Q:   What is the percentage uncertainty in the distance to the LMC,
            based on eclipsing binary stars?


                 The difference between mean and min or max distances
                 is about 0.35 kpc.  

                    d  =  49.88 +/- 0.35 kpc


                 The uncertainty in distance can be expressed as a 
                 percentage as

                                     0.35 
                    uncert in d  =  ------   =   0.007  =   0.7 percent
                                    49.88


                 Note that the fractional uncertainty, 0.007, is a bit less
                 than half the uncertainty in distance modulus, 0.016.