Which graph type is used to represent quantitative data?

• A. Bar Graph
• B. Line Graph
• C. Pie Chart
• D. Histogram

Answer: (D)

Understanding how a numeric variable is distributed across its range is key here. A histogram is designed for this purpose because it groups data into intervals (bins) along a numeric axis and shows how many observations fall into each interval with the height of the bars. This setup lets you quickly see the distribution’s shape—whether it’s symmetric or skewed, where data cluster, how spread out it is, and if there are multiple peaks or outliers.

Bar graphs, in contrast, compare separate categories rather than reveal the distribution of a numeric measure. Line graphs are best for showing changes over an ordered dimension (often time). Pie charts illustrate parts of a whole as percentages for categorical data, not the spread of a numeric variable. So for representing quantitative data and its distribution, the histogram is the most appropriate choice.