The lengths, in kilometers, of the world's largest subway systems are listed below.

City	Length
Moscow	340
Paris	211
London	415
Tokyo	281
New York City	371

a) What is the variable of interest? Is it categorical (qualitative) or numerical (continuous or discrete)? Explain.

b) Explain which graph(s) can be used to display the given information,

and which can not be used. Explain why or why not.

c) Make all appropriate graphs, using Excel and label them carefully.