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Probability Question:what is the probability that 2 or more students in a class of 20 have the same birthday?
A little probability and statistics problem from textbook: Can anyone explain the solution? The answer is 0.417. Hint is P(x>=2)=1-P(x<2) This is from 2nd edition of Alberto Leon-Garcia's text. stupid graduate level class at UCLA with stupid undergrad questions.
what is the probability that two or more (2) students in a class of 20 have the same birthday?
2 Answers
- M3Lv 710 years agoFavorite Answer
1 - P[<2] = 1 - P[no two have same birthday]
= 1 - 365/365 *364/365 * ....... 346/365 = 1 - (365!/345!) /365^20 = 0.4114 <----------
