Question 560154: Suppose that 10% of Americans are afraid of being alone in a house at night. If a random sample of 12 Americans is selected, find the following probability by using the binomial table. There are exactly 3 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 12 Americans is selected, find the following probability by using the binomial table. There are exactly 3 people in the sample who are afraid of being alone at night.
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Binomial Problem with n = 12 and p(afraid) = 0.1
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P(x = 3) = 12C3*0.1^3*0.9^9 = binompdf(13,0.1,3) = 0.0997
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Cheers,
Stan H.
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