On a frequency distribution graph, what do the X-axis values typically represent?

• A. Frequencies
• B. Class intervals or scores
• C. Time
• D. Cumulative counts

Answer: (B)

The x-axis in a frequency distribution graph represents the categories or value ranges used to group the data—these are the class intervals or scores. The frequencies, or how many observations fall into each category, are shown on the y-axis. This setup lets you see how the data are spread across different values and where concentrations occur. Time would only appear on the x-axis in graphs that track changes over time, and cumulative counts are typically depicted in a cumulative frequency plot rather than as the usual x-axis for a standard frequency distribution.