SOLUTION: Traffic researchers determined that at a particular stop light, there is a 45% chance that drivers will come to a complete stop on a red light, and a 55% chance they will drive thr

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Question 529165: Traffic researchers determined that at a particular stop light, there is a 45% chance that drivers will come to a complete stop on a red light, and a 55% chance they will drive through the light without doing so. What is the probability that 4 of the first 12 drivers that arrive at the light during a period of observation will completely stop?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
Traffic researchers determined that at a particular stop light, there is a 45% chance that drivers will come to a complete stop on a red light, and a 55% chance they will drive through the light without doing so. What is the probability that 4 of the first 12 drivers that arrive at the light during a period of observation will completely stop?
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Binomial Problem with n = 12 and p(stop)= 0.45
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P(x = 4) = 12C4*0.45^4*0.55^8 = 0.1700
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Cheers,
Stan H.
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