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In: Statistics and Probability

4. A subway has good service 70% of the time and runs less frequently 30% of...

4. A subway has good service 70% of the time and runs less frequently 30% of the time because of signal problems. When there are signal problems, the amount of time in minutes that you have to wait at the platform is described by the pdf probability density function with signal problems = pT|SP(t) = .1e −.1t.

But when there is good service, the amount of time you have to wait at the platform is probability density function with good service = pT|Good(t) = .3e −.3t.

You arrive at the subway platform and you do not know if the train has signal problems or running with good service, so there is a 30% chance the train is having signal problems.

(a) After 1 minute of waiting on the platform, you decide to re-calculate the probability that the train is having signal problems based on the fact that your wait will be at least 1 minute long. What is that new probability?

(b) After 5 minutes of waiting, still no train. You re-calculate again. What is the new probability?

(c) After 10 minutes of waiting, still no train. You re-calculate again. What is the new probability?

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orchestra answered 2 years ago
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