Which of the following is used to illustrate sets of numerical data?

The use of bar graphs to illustrate sets of numerical data is particularly effective when comparing different categories or groups. Bar graphs display data with rectangular bars, where the length of each bar corresponds to the value it represents. This makes it easy to see and compare the values across various categories visually.

Bar graphs work well for representing discrete data, where each category is distinct. For instance, if you wanted to show the number of students in different majors at a university, a bar graph would clearly depict how many students are enrolled in each major through comparative bar lengths.

Other graph types, such as histograms, are typically used for continuous data and to show frequency distributions, while pie charts represent parts of a whole and are better for displaying proportions rather than comparisons of different categories. Line graphs are most effective for showing trends over time rather than categorical comparisons. Thus, bar graphs serve a unique and essential purpose when it comes to illustrating sets of numerical data effectively and clearly.