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Unformatted text preview: STA Class 22:57:54 Example 3: Tires (fig 6.2-10) o The Goodyear Ti re Company manufactures car t i res that last distances that are normally distributed with a mean of 38,000 miles and a standard deviation of 4500 miles. A. If a t i re is randomly selected, what is the probability i t lasts more than 35,000 miles? B. if 60 t i res are randomly selected, what is sampling distribution of the sample mean? C. if 60 t i res are randomly selected, what is the probability they last distances that have a mean greater than 37,500 miles? D. if the manufacturer wants to guarantee the ti res so that only 4% will be replaced because of failure before the guaranteed number of miles, for how many miles should the t ires be guaranteed? Exam 2 o o o Date: Oct 8th Time: 1:30 to 2:20 pm Materials: Pen, Calculator, one 8 x 11' Formula Sheet, TABLES, Student ID o Content: Chapters 4-6, class notes and examples, homework problems ...
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- Fall '07
- Standard Deviation