A bar chart displays the average study hours per course, computed from a CSV dataset of 100 students. The visualization uses D3 v7 with SVG rendering, loading data via `d3.csv` and aggregating it with `d3.group` and `d3.mean`. The chart encodes course categories on the x-axis using `d3.scaleBand` and average hours on the y-axis with `d3.scaleLinear`, applying styled rectangles and labeled axes.