In probability theory and statistics, a sequence of independent Bernoulli trials with probability 1/2 of success on each trial is metaphorically called a fair coin. One for which the probability is not 1/2 is called a biased or unfair coin. In theoretical studies, the assumption that a coin is fair is often made by referring to an ideal coin.
Some coins have been alleged to be unfair when spun on a table, but the results have not been substantiated or are not significant. There are statistical procedures for checking whether a coin is fair.
Read more about Fair Coin: Role in Statistical Teaching and Theory, Fair Results From A Biased Coin
Famous quotes containing the words fair and/or coin:
“She shall get a duke, my dear,
As duck do get a drake;
And she shall have a young prince,
For her own fair sake.”
—Unknown. Green Grass (l. 9–12)
“The oft-repeated Roman story is written in still legible characters in every quarter of the Old World, and but today, perchance, a new coin is dug up whose inscription repeats and confirms their fame. Some “Judæa Capta,” with a woman mourning under a palm tree, with silent argument and demonstration confirms the pages of history.”
—Henry David Thoreau (1817–1862)