:4. A box contains 1,000,000 tickets.  An unknown percentage of
them are red; the rest are blue.  A random sample of 400 tickets
are drawn from the box.  An approximate 95% confidence interval
for the percentage of blue tickets in the box is closest to 

 	
 a.  212% +/  5% 
 	
 
 	
 b.  53% +/  5% 
 	
 
    c.  53% +/  10%
 	
 
 	
 d.  53% +/  2.5% 

 	
 e.  212% +/  2.5%