If the number of cholera deaths in a city is plotted on a map, one is creating a:

• A. Measles Chart
• B. Choropleth Chart
• C. Pie Chart
• D. Control Chart

Answer: (A)

Plotting the number of cholera deaths on a map is a choropleth chart. In a choropleth, geographic areas such as neighborhoods or districts are shaded in colors to represent the magnitude of a variable—here, death counts or rates. This visualization makes it easy to see where the impact is highest and how it varies across the city.

A pie chart would show parts of a whole without geographic context, a control chart tracks a process over time rather than location, and a term like “measles chart” isn’t a standard chart type. The map with area-based shading is the choropleth approach.