m218_f09_mt1_practice1

m218_f09_mt1_practice1 - Midterm 1 Practice Problems Part 1...

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Unformatted text preview: Midterm 1 { Practice Problems Part 1 1. In an e ort to increase sales an automobile dealership collected information on the last 1000 customers that purchased one of their cars. They found that 55% of them were male, 20% bought a small automobile, 66% of the males bought a large automobile, and 75% of those who bought a mid-sized automobile were female. In addition, when one of these customers is selected at random the events \bought a small automobile" and \male" are independent. (a) Fill in all the spaces in the contingency table below to represent these 1000 customers. (b) One of the female customers is selected at random. What is the probability that she bought a small automobile? 2. The Payless Insurance Company has three types of customers; high risk, medium risk and low risk. 30% of its customers are high risk, 50% are medium risk and 20% are low risk. From past experience they know that there is a 10% probability that a high risk customer will make one or more claims in any one-year period but only a 4% probability that a medium risk customer will do so. (a) Draw a tree diagram for this situation lling in as much information as you can....
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m218_f09_mt1_practice1 - Midterm 1 Practice Problems Part 1...

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