What kind of frequency distribution graph shows the frequencies as bars, with no space between adjacent bars?

• A. A bar graph
• B. A histogram
• C. A polygon
• D. All of these

Answer: (B)

Histograms display the distribution of a continuous variable by grouping data into bins and drawing bars that touch each other. The bars touching indicates there isn’t a gap between values, reflecting a smooth, continuous range of data. A bar graph, by contrast, uses separate categories and leaves space between bars to show that each category is distinct. A polygon refers to a line graph that connects points (often the midpoints of class intervals) rather than using bars. So the graph with frequencies shown as touching bars is a histogram.