When drawing cumulative frequency graphs, where should you plot the point?

When constructing a cumulative frequency graph, the points should be plotted at the highest value of each class interval. This is because a cumulative frequency graph is designed to show the total number of data points that fall below a certain value. By using the highest value for each class, you accurately represent the cumulative total up to that point, ensuring that each segment of the graph reflects the total number of observations included in all preceding class intervals.

If you instead plotted at the midpoint, lowest value, or average of each class, the cumulative frequency would not accurately reflect the data accumulation. Using the highest value allows for a clear and correct interpretation of the cumulative distribution, essential for analyses such as finding percentiles or making comparisons between different data sets.