In a statistics class, students are asked to graph the distribution of test scores. Which graph should they use to determine how many students scored below a certain value, and what is the main feature of this graph?

• A. A frequency polygon shows frequencies at midpoints
• B. An ogive shows cumulative frequency at upper class boundaries
• C. A histogram shows frequencies as bars
• D. A stem-and-leaf plot shows raw data values

Answer: (B)