Coin Toss Is Not As Fair As Thought; Researchers Prove Bias After 350,757 Flips

"A coin is 50.8% likely to land on the same side it started on when tossed.", researchers found. They conducted 350,757 coin flips, using coins from 46 global currencies to prevent design bias. This appears to validate Stanford mathematician Persi Diaconis' 2007 study, which suggested a slight bias of about 51% in coin toss toward the side it started on.

The way you flip a coin could mean it's not as random as you'd expect. Here's the paper, providing strong evidence that when some (but not all) people flip a fair coin, it tends to land on the same side it started. 🔗 https://arxiv.org/pdf/2310.04153.pdf

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