This interactive bar chart visualizes the average math score for each academic department, derived from a CSV file containing individual student scores. The D3.js v7 code groups the data by department and computes the mean using `d3.group` and `d3.mean`, with bars and axes rendered as SVG elements. The visualization employs a `scaleBand` for the categorical x-axis and a `scaleLinear` for the continuous y-axis, both using standard D3 axis generators. Hovering over a bar triggers a CSS transition, changing its fill color from blue to amber.