Question 617241: 1 out of 5 of a certain type of car has tire defects. At a new car lot, there are 12 of these cars. Calculate the probability that the given number of cars have the defects.
a) 1
b) 3
*Thank you so much! Maybe I can get a tutor from here too. That would be nice.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! 1 out of 5 of a certain type of car has tire defects. At a new car lot, there are 12 of these cars. Calculate the probability that the given number of cars have the defects.
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Binomial Problem with n = 12 and p(defect) = 1/5
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a) 1
p(x = 1) = 12C1*(1/5)(4/5)^11 = binompdf(12,1/5,1) = 0.2062
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b) 3
P(x = 3) = 12C3*(1/5)^3(4/5)^9 = binompdf(12,1/5,3) = 0.2362
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Cheers,
Stan H.
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