the.com/probability
the math that turns gut feelings into numbers and casinos into empires
means The branch of mathematics that measures how likely something is to happen, expressed as a number between impossible (0) and certain (1).
from From Latin 'probabilis,' meaning 'provable' or 'credible,' rooted in 'probare,' 'to test, prove, approve' — the same source that gives us 'probe' and 'prove.' For centuries it simply meant 'worthy of belief'; the precise mathematical sense was forged in the 17th century out of correspondence between Pascal and Fermat puzzling over gambling problems, when 'likely to be true' hardened into 'measurably likely.'
- birth certificate
- Born from gamblers' letters between Pascal and Fermat, 1654
- birthday paradox
- 23 people, 50% odds two share a birthday
- casino edge
- Roulette pays 35-to-1 on 37-to-1 odds
- monkey theorem
- Infinite typing eventually yields all of Shakespeare
- gambler's fallacy
- Coins have no memory of past flips
monty hall problem — counterintuitive probability puzzle where switching doors after one is revealed increases winning chance from 1/3 to 2/3
birthday paradox — in a group of 23 people, there's a 50% chance two share a birthday, defying intuition
long tail distribution — netflix found 80% of rentals came from movies outside the top 10,000 titles, showing rare events dominate