Box plots - foreign country visits

http://cnx.org/content/m46174/latest/?collection=col11521/latest

 

Box plots are helpful for depicting groups of numerical data through their quartiles.  This box plot compares three countries – Germany, America and China.  Specifically, the data shows results of a survey of 20 year-olds in each country when asked how many foreign countries they had visited in their lifetime.  We can see that 20 year-old Germans have visited the most foreign countries (between 4 and 8 countries), with American 20 year olds behind (between 0 and 5 countries) and Chinese 20 year olds without any data (which I assume means 0 countries).