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Unformatted text preview: Math331, Spring 2008 Instructor: David Anderson Section 4.4 Homework Answers Homework: pgs. 173  174, #s 2, 3, 7, 11, 12. 2. Suppose the person chooses to park illegally. Let X be the amount of money he will pay on a given day. We have E [ X ] = 25 * . 6 + 0 * . 4 = 15 . Therefore he can expect to pay 15 per day on average. It is better to park legally. 3. Let X be the winnings from a single ticket in dollars. Then, based on what we were given, p (1 , 200 , 000) = 1 / (2 * 10 6 ), p (800) = 500 / (2 * 10 6 ), p (30) = 4000 / (2 * 10 6 ) and p (0) = 1 1 / (2 * 10 6 ) 500 / (2 * 10 6 ) 4000 / (2 * 10 6 ). Thus, E [ X ] = 1 , 200 , 000 1 2 * 10 6 + 800 500 2 * 10 6 + 30 4000 2 * 10 6 + 0 = . 86 . 7. We are given that if X is the demand for a magazine at a specific newsstand, then R ( X ) = { 4 , 5 , 6 , 7 } . The magazine sells for $ a and costs $2 a/ 3 to the owner, and the owner can not return unsold magazines. So, how many magazines should be ordered? For each i R ( X ), let...
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This note was uploaded on 03/31/2008 for the course MATH 331 taught by Professor Anderson during the Spring '08 term at Wisconsin.
 Spring '08
 Anderson
 Math, Probability

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