L12-ss

# L12-ss - The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL...

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5/26/11 Lecture 12 1 STOR 155 Introductory Statistics Lecture 12: Birthday Problem and Random Variables The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL

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5/26/11 Lecture 12 2 Review
5/26/11 Lecture 12 3

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5/26/11 Lecture 12 4
5/26/11 Lecture 12 5

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5/26/11 Lecture 12 6 Birthday Problem • In a classroom of 45 people, what is the probability that at least two people have the same birthday? • Event A : at least two people have the same birthday out of the 45 people. A C : every person has a different birthday out of the 45 people. P ( A ) = 1 - P ( A C ) = … ( see the board )
5/26/11 Lecture 12 7 Free throws • A TarHeel basketball player is a 80% free throw shooter. • Suppose he will shoot 20 free throws during each practice. • Which is more likely: to make 5 out of 20, or 18 out of 20 ? • How many free throws he makes on average during practice?

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Lecture 12 8 • Experiment: – A TarHeel basketball player shoots 20 free throws during his practice. X
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## This note was uploaded on 11/18/2011 for the course STOR 155 taught by Professor Andrewb.nobel during the Summer '08 term at UNC.

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L12-ss - The UNIVERSITY of NORTH CAROLINA at CHAPEL HILL...

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