What is a histogram used for?

• A. To show the frequency of categorized data points within defined ranges
• B. To compare two metrics side-by-side
• C. To show parts to a whole
• D. To display a continuous line over time

Answer: (A)

A histogram is about showing how a numeric variable is distributed across value ranges. It groups data into consecutive intervals (bins) like 0–9, 10–19, 20–29, and so on, and uses the height of each bar to show how many observations fall into each interval. This makes the overall shape of the data visible—the central tendency, spread, skew, and whether there are any peaks or outliers. It’s specifically for numeric data and contrasts with bar charts, which display categorical data with gaps between bars, and pie charts or line charts, which show parts of a whole or changes over time, respectively. So the histogram’s purpose is to illustrate the frequency of numeric values within defined ranges. For example, exam scores binned by score ranges would reveal how many students scored within each range and the overall distribution.