Which type of graph uses $\mathrm{percentages}$ to show how each category relates to the whole data set?

• A. $\mathrm{Pie} \mathrm{chart}$
• B. $\mathrm{Histogram}$
• C. $\mathrm{Box} \mathrm{plot}$
• D. $\mathrm{Scatter} \mathrm{plot}$

Answer: (A)

Verified step by step guidance

1. Understand that the question asks for a graph type that represents categories as parts of a whole using percentages.
2. Recall that a pie chart is designed to show proportions of categories as slices of a circle, where each slice's size corresponds to the percentage of that category relative to the total.
3. Recognize that a histogram displays frequency distributions of numerical data, not percentages of categories in a whole.
4. Know that a box plot summarizes data distribution through quartiles and median, without showing category percentages.
5. Identify that a scatter plot shows relationships between two numerical variables using points, not percentages of categories.