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Last edited Feb 27, 2018

Created on Feb 27, 2018

This example presents two JavaScript practice problems embedded in a static HTML page, with no SVG or visual output. It shows a small array of four U.S. states and their populations, then asks the viewer to compute the mean population using the D3 v4 API’s `d3.mean()` method, and again without it. The code prints results to the browser’s developer console, and includes a minimal inline style for full-screen body margins. The data is hardcoded in the script, and the page uses only D3’s core utility function for the first calculation.

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