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-8- 2008 AP® STATISTICS FREE-RESPONSE QUESTIONS (Form B)
5. Flooding has washed out one of the tracks of the Snake Gulch Railroad. The railroad has two parallel tracks from
Bullsnake to Copperhead, but only one usable track from Copperhead to Diamondback, as shown in the figure
below. Having only one usable track disrupts the usual schedule. Until it is repaired, the washed-out track will
remain unusable. If the train leaving Bullsnake arrives at Copperhead first, it has to wait until the train leaving
Diamondback arrives at Copperhead. Every day at noon a train leaves Bullsnake heading for Diamondback and another leaves Diamondback heading
Assume that the length of time, X, it takes the train leaving Bullsnake to get to Copperhead is normally
distributed with a mean of 170 minutes and a standard deviation of 20 minutes.
Assume that the length of time, Y, it takes the train leaving Diamondback to get to Copperhead i...
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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.
- Fall '11