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How are casino dice made so that each face is equally likely?
AThe dice are weighted evenly on all six sides
BThe dice are rolled only inside a closed box
CThe faces are marked with paint instead of pips
DThe faces are flat and the holes are filled in
Answer & Solution
Correct answer: D. The faces are flat and the holes are filled in
1. Ordinary dice carve out holes for the spots, so faces with more spots lose slightly more material.
2. That small weight difference can bias the outcomes.
3. Casino dice have flat faces because the holes are filled with paint of the same density as the die itself.
4. With no weight difference left between faces, each face is equally likely to occur.
_Source: OpenStax Introductory Business Statistics (CC BY 4.0), Ch 3 "Probability Topics", section 3.1 Terminology_
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