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Unformatted text preview: s normally distributed with a mean of 200 minutes and a standard deviation of 10 minutes. These two travel times are independent. (a) What is the distribution of Y X? (b) Over the long run, what proportion of the days will the train from Bullsnake have to wait at Copperhead for the train from Diamondback to arrive? (c) How long should the Snake Gulch Railroad delay the departure of the train from Bullsnake so that the probability that it has to wait is only 0.01 ? © 2008 The College Board. All rights reserved. Visit apcentral.collegeboard.com (for AP professionals) and www.collegeboard.com/apstudents (for students and parents). GO ON TO THE NEXT PAGE. -9- 2008 AP® STATISTICS FREE-RESPONSE QUESTIONS (Form B) STATISTICS SECTION II Part B Question 6 Spend about 25 minutes on this part of the exam. Percent of Section II score—25 Directions: Show all your work. Indicate clearly the methods you use, because you will be graded on the correctness of your methods as well as on the accuracy of your results and explanations. 6. The nerves that supply sensation to the front portion of a person’s foot run between the...
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This note was uploaded on 07/07/2013 for the course SAT AP taught by Professor Mr.zhang during the Fall '11 term at Benjamin N Cardozo High School.

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