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STAT 333 tutorial1

# STAT 333 tutorial1 - Stat 333 Tutorial 1 1 Two events A and...

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Stat 333 - Tutorial 1 1. Two events A and B are mutually exclusive with P ( A ) = 0 . 25 and P ( B ) = 0 . 3 . Find: i) P ( A B ) ii) P ( ¯ A ¯ B ) 2. You are given that the sample space S = A B where P ( A ) = 0 . 55 and P ( B ) = 0 . 6 . Find: i) P ( A B ) ii) P ( B | A ) iii) P ( B | ¯ A ) 3. (Chapter 1 Problem #42 of the textbook.) There are three coins in a box. One is a two- headed coin, another is a fair coin, and the third is a biased coin that comes up heads 75 percent of the time. When one of the three coins is selected at random and flipped, it shows heads. What is the probability that it was the two-headed coin? 4. (J.G. Kalbfleisch. Probability and statistical inference. Number v. 1 in Springer texts in statistics. Springer-Verlag, 1985. Section 3.6 Problem #14.) A gambler is told that one of two slot machines pays off with probability p 1 , while the other pays off with probability p 2 < p 1 . Once a machine has been selected, successive plays are independent. The gambler selects one machine at random and plays that machine n times.
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