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."
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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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