This interactive line chart shows the relationship between hours studied and average exam score, aggregating individual student records into rounded hourly bins and plotting the mean score for each bin as a connected line with orange data points. Hovering over a point reveals a tooltip with the exact values. The visualization is built with D3 v7, using `d3.csv` to load the dataset, `d3.groups` and `d3.mean` for aggregation, and `d3.scaleLinear` with `d3.axisBottom` and `d3.axisLeft` for the coordinate system. It renders as SVG with animated transitions, styled with CSS for a clean card-based layout.