In this lesson, students learned how to create and interpret bar graphs. They discussed the details that should be included on the graph, such as the types of machines (A, B, C, and D) and the time taken by each machine to complete tasks (20 minutes for A, 10 for B, and 40 for C). The lesson emphasized the importance of properly labeling the axes and arranging the data either vertically or horizontally. Students practiced plotting the information accurately to illustrate the differences in task completion times.