Question 643270: "A researcher found that 85% of customers who make purchase at a department store are please with the store customer service. We asked 20 customers whether or not they are pleased with the store customer service. Is this a binomial experiement? Use the correct formula to find that the probability that, out of 20 customers, exactly 12 of them are pleased with the customer service."
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! "A researcher found that 85% of customers who make purchase at a department store are please with the store customer service. We asked 20 customers whether or not they are pleased with the store customer service. Is this a binomial experiement? Use the correct formula to find that the probability that, out of 20 customers, exactly 12 of them are pleased with the customer service."
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Binomial Problem with n = 20 and P(purchase) = 0.85
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P(x = 12) = 20C12*0.85^12*0.15^8 = binompdf(20,0.85,12) = 0.0046
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Cheers,
Stan H.
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