The table shows the number of 18- to 24-year-old noncitizens living in the United States between 2010 and 2012.

Noncitizens aged 18 to 24 in the United States
Region of Birth ................................Number (in Thousands)
Africa ...............................................................115
Asia ..................................................................590
Europe .............................................................148
Latin America & Caribbean ...........................1,666
Other ..................................................................49
Total ..............................................................2,568

a. Is Region of Birth quantitative or categorical? Show how to summarize results by adding a column of percentages to the table. 

b. Which of the following is a sensible numerical summary for these data: Mode (or modal category), mean, median? Explain, and report whichever is/are sensible.
c. How would you order the Region of Birth categories for a Pareto chart? What’s its advantage over the ordinary bar graph?