What Makes a Coin ‘Flip’ Fairly?

A coin flip feels fair because it has two sides, and both seem equal. Imagine you’re flipping a coin, heads or tails, like choosing between chocolate or vanilla ice cream. But just like some people might prefer chocolate every time, sometimes the way we flip can make one side land more often than the other. It’s still mostly fair, but not completely.

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Examples

  1. Flipping a coin to decide who goes first in a game is fair, mostly.
  2. Sometimes, even if you flip a coin really fast, it might still land on the same side it started on.
  3. If a coin is bent or worn down, it may favor one side more than the other.

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Categories: Math · probability· fairness· coin-flip