Jose looked at the raw data and discovered that the 54 data values included both the city and highway mileages for 27 cars. He used the city mileages for the 27 cars to make the histogram below.

a) What is the total number of data values in the raw data?
b) How many cars' mileages were used to create the histogram?
c) Did the raw data include both city and highway mileages for all 54 data values?
d) What information can be inferred from the histogram about the distribution of city mileages?