> How do you test a coin to determine if it’s unbiased? It's almost impossible to bias a coin. To bias a coin, you have to both design it carefully and flip it

> How do you test a coin to determine if it’s unbiased? It's almost impossible to bias a coin. To bias a coin, you have to both design it carefully and flip it in a specific way that's incredibly obvious. > How do you test a roulette wheel? There are statistical techniques that give you a confidence that the roulette wheel is unbiased. You keep spinning it again and again and plugging the results into the equations. They spit out numbers that trend towards (or away) from 100% certain. At some point, you accept that it's close enough to 100 (or 0) and move on with life.