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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).
 Fall '07
 HONG

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