Which data visualization is best to show the distribution of a single numeric variable?

Which data visualization is best to show the distribution of a single numeric variable?

• A. Histogram
• B. Bar chart
• C. Pie chart
• D. Line chart

Answer: (A)

To understand the spread and shape of a single numeric variable, you use a histogram. It groups data into bins along the numerical axis and shows how many observations fall into each bin, revealing the overall distribution—whether it’s symmetric or skewed, where most values lie, and whether there are multiple peaks or outliers. A bar chart, by contrast, compares distinct categories and would treat numeric values as separate categories, which can obscure the distribution when there are many possible values. A pie chart is designed to show parts of a whole and is best for categorical compositions, not the distribution of a numeric variable. A line chart displays changes over an ordered axis (often time) and is about trends, not how values are distributed across their range. So the histogram is the best choice for this purpose.

To understand the spread and shape of a single numeric variable, you use a histogram. It groups data into bins along the numerical axis and shows how many observations fall into each bin, revealing the overall distribution—whether it’s symmetric or skewed, where most values lie, and whether there are multiple peaks or outliers. A bar chart, by contrast, compares distinct categories and would treat numeric values as separate categories, which can obscure the distribution when there are many possible values. A pie chart is designed to show parts of a whole and is best for categorical compositions, not the distribution of a numeric variable. A line chart displays changes over an ordered axis (often time) and is about trends, not how values are distributed across their range. So the histogram is the best choice for this purpose.