This histogram chart visualizes the Irwin–Hall distribution by generating 10,000 random samples and grouping them into bins. Built with D3 v3, it employs the reusable chart module pattern, where a `histogramChart()` function configures scales, axes, and bars. The chart uses `d3.layout.histogram` for binning, an ordinal x-scale for bar positions, and an SVG rendering with a bottom axis. The code also demonstrates the use of `d3.rebind` to expose histogram properties and the x-axis tick format, while the parent script generates sample data via `Math.random`.