1. The problem: Understand what an "ogive" is in statistics. 2. Definition: An ogive is a graph that represents the cumulative frequency or cumulative relative frequency of a data set. 3. Formula: The cumulative frequency at a class interval is the sum of the frequencies of all classes up to that interval. 4. Explanation: It helps to see how many data points fall below a particular value. 5. Construction: Plot cumulative frequencies on the y-axis against the upper class boundaries on the x-axis. 6. Usage: Ogives are useful for finding medians, quartiles, and percentiles visually. 7. Summary: An ogive is a cumulative frequency graph that shows the accumulation of frequencies up to each class boundary.