Measurements of the same galaxies mentioned in Exercise 12 above have been made 
many times since 1931.  A sample of measurements made since 1995 yield the 
following:

GALAXY NAME  VELOCITY     DISTANCE
-----------  --------     -------- 
 
NGC 4472       997 km/s    14.4 Mpc
NGC 3193      1399         21.0
NGC 6824      3386         46.6
NGC 7619      3762         56.7
NGC  384      4287         57.2   
NGC 2563      4900         75.5 
NGC 1277      5066         68.3 
NGC 4853      7660        115.0
Baade 24     12500        169.0 
Leo 1        20200        302.0 

From these data, do the same thing as you did in Exercise 12 - calculate
the Hubble constant, estimate the random error, and discuss the systematic
errors.  How much difference is there between Hubble and Humason's results
and these results?