Question 341986: Not all visitors to a certain company's website are customers. In fact, the website administrator estimates that about 10% of all visitors to the website are looking for other websites. Assuming that this estimate is correct, find the probability that, in a random sample of 4 visitors to the website, exactly 2 actually are looking for the website.
Answer by stanbon(75887)   (Show Source):
You can put this solution on YOUR website! Not all visitors to a certain company's website are customers.
In fact, the website administrator estimates that about 10% of all visitors to the website are looking for other websites.
Assuming that this estimate is correct, find the probability that, in a random sample of 4 visitors to the website, exactly 2 actually are looking for the website.
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Binomial with n = 4 and p = 0.1
P(x=2) = 4C2(0.9)^2*(0.1)^2 = binompdf(4,0.9,2) = 0.0486
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Cheers,
Stan H.
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