SOLUTION: Suppose that 10% of Americans are afraid of being alone in a house at night. If a random sample of 13 Americans is selected, find the following probability by using a binomial tabl

Question 560130: Suppose that 10% of Americans are afraid of being alone in a house at night. If a random sample of 13 Americans is selected, find the following probability by using a binomial table. Give your final answer to to three decimal places. There are exactly 4 people in the sample who are afraid of being alone at night.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Suppose that 10% of Americans are afraid of being alone in a house at night. If a random sample of 13 Americans is selected, find the following probability by using a binomial table. Give your final answer to to three decimal places. There are exactly 4 people in the sample who are afraid of being alone at night.
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Binomial Problem with n = 13 and p(afraid) = 0.10
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P(x = 4) = 13C4*(0.1)^4*(0.9)^9 = binompdf(13.0.1,4) = 0.0277
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Cheers,
Stan H.
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