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Cars on the road (Posted on 2004-04-09) Difficulty: 2 of 5
If the probability of observing a car (read: at least one car) in 20 minutes on a highway is 609/625, what is the probability of observing a car (read: at least one) in 5 minutes (assuming constant default probability)?

See The Solution Submitted by SilverKnight    
Rating: 2.5000 (4 votes)

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answer | Comment 1 of 20
ans: 3/5 i.e. 60%

no car in 20 min: 16/625

no car in 5 min: (16/625)^1/4=2/5

car in 5 min 1-2/5= 3/5= 60%

ady
  Posted by Ady TZIDON on 2004-04-09 11:17:28
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