Question 547241
a doctor claims to have discovered a cure for a disease. half of the people with disease have recovered without treatment. He treats 200 patients, 120 of whom recover. whats the probability that all 120 would have recovered?
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Binomial Problem with n = 200 and p(cure) = 1/2
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P(x = 120) = 200C120*(1/2)^120*(1/2)^80 = 0.0010

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Cheers,
Stan H.
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