# Lecture11 - GEM2900 Understanding Uncertainty Statistical...

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DSAP, NUS, Semester 1, 2008/2009 – 1 GEM2900: Understanding Berwin Turlach [email protected] Department of Statistics and Applied Probability National University of Singapore

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DSAP, NUS, Semester 1, 2008/2009 – 104 Birthday problem How large does a group of (randomly selected) people have to be such that the probability that at least two people share the same birthday is larger that 0.5? You may assume that a year has only 365 days, i.e. ignore leap years. You may further assume that any day of the year is equally likely to be the birthday of a randomly selected person. Answer: under these assumptions, the probability of having at least one shared birthday is just over 0.5 if there are 23 persons in the room. Woolfson (2008, Chapter 5.1)
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## This note was uploaded on 03/19/2012 for the course SCIENCE 2900 taught by Professor Forgot during the Spring '08 term at National University of Singapore.

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Lecture11 - GEM2900 Understanding Uncertainty Statistical...

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