My family owned two Honda Civics. One of them is 1999 and lasted 8.5 years without a major repair. Other one (2002) lasted 9.5 years, but the distribution of 2002 Honda Civic had higher mean (8.5) with a standard deviation of 2.1 years. Which Honda Civic did better relative to other Honda Civics from the same year? (compare z scores from different normal distributions:1999 and 2002).