SOLUTION: Bank robbers brandish firearms to threaten their victims in 80% of the incidents. An announcement that six bank robbers are taking place is being broadcast. What is the probability

Question 643972: Bank robbers brandish firearms to threaten their victims in 80% of the incidents. An announcement that six bank robbers are taking place is being broadcast. What is the probability that a firearm is being used in atleast one of the robberies?
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Bank robbers brandish firearms to threaten their victims in 80% of the incidents. An announcement that six bank robbers are taking place is being broadcast. What is the probability that a firearm is being used in atleast one of the robberies?
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Binomial Problem with n = 6 and p(gun) = 0.8
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P(1<= x <=6) = 1 - P(x = 0)
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= 1 - 0.2^6
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= 1 - 0.000064
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= 0.9999
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Cheers,
Stan H.
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