Last Updated
：2025/12/05
birthday paradox
Noun
Japanese Meaning
無作為に選ばれた集団において、23人ほどで50%以上の確率で誰かの誕生日が重なるという、直感に反する統計学の現象
Quizzes for review
(probability theory) The counterintuitive observation that a random group of people needs to have only 23 members before there is a 50% chance of two of them having the same birthday.
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birthday paradox
When I mentioned the birthday paradox in class, the students were shocked to learn that a random group of only 23 people already gives about a 50% chance that two of them share a birthday.
See correct answer
When I mentioned the birthday paradox in class, the students were shocked to learn that a random group of only 23 people already gives about a 50% chance that two of them share a birthday.
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