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au9para
13.02.2020 •
Mathematics
John needs to catch a train. The train arrives randomly some time between 2:00 and 3:00, waits for 20 minutes, and then leaves. If John also arrives randomly between 2:00 and 3:00, what is the probability that the train will be there when John arrives?
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Ответ:
Step-by-step explanation:
If train arrives between 2:00 to 3:00 (60min) and waits for 20 min and leaves, probability of finding train in that 60 min is
.
Probability of finding John is
can arrive any minute.
now the probability of finding both john and train is
*
=
.
This is compound Probablity Problem.
Ответ:
169.15 is the correct answer