Xavier takes 78 minutes to drive to Epping and 65 minutes to drive to the city.

The mean time to Epping is 75.3 minutes with a standard deviation of 2.6,

while the mean time to the city is 62.7 minutes with a standard deviation of 1.7.

a Calculate the z-scores for Xavier's trips to Epping and the city.

b Which was the longer trip in comparison with the mean? detailed explanation why it is city