# 319handout3 - Econ 319, Fall 2008 TA: Simon Kwok Handout 3...

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Econ 319, Fall 2008 TA: Simon Kwok Handout 3 1. Two students A and B are both registered for a certain course. Assume that student A attends class 90% of the time, student B attends class 50% of the time, and the absences of the two students are independent. (a) What is the probability that at least one of the two students will be in class on a given day? (b) If at least one of the two students is in class on a given day, what is the probability that A is in class that day? 2. Suppose that in Ithaca 30% of the people are Republican, 50% are Democrat, and 20% are Independents. In the last election suppose that 65% of the Republicans voted, 82% of the Democrats voted, and 50% of the Independents voted. If a person is selected at random and it is learned that the person DID NOT vote in the last election, what is the probability that Rule] 3. You are given three events: A, B and C. (a) Is
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## This note was uploaded on 10/19/2008 for the course ECON 3190 taught by Professor Hong during the Fall '07 term at Cornell University (Engineering School).

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