A First Course in Probability (10th Edition)
A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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The route used by a certain motorist in commuting to work contains two intersections with traffic signals. The probability
that he must stop at the first signal is 0.4, the analogous probability for the second signal is 0.45, and the probability that
he must stop at at least one of the two signals is 0.65.
(a) What is the probability that he must stop at both signals?
(b) What is the probability that he must stop at the first signal but not at the second one?
(c) What is the probability that he must stop at exactly one signal?
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Transcribed Image Text:The route used by a certain motorist in commuting to work contains two intersections with traffic signals. The probability that he must stop at the first signal is 0.4, the analogous probability for the second signal is 0.45, and the probability that he must stop at at least one of the two signals is 0.65. (a) What is the probability that he must stop at both signals? (b) What is the probability that he must stop at the first signal but not at the second one? (c) What is the probability that he must stop at exactly one signal?
Expert Solution
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Step 1

Let  A=he must stop at the first signalB=he must stop at the second signalGiven,P(A)=0.4 P(B)=0.45P(AB)=0.65

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