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In a clinical trial, a drug used to relieve pain caused side effects in 9% of the patients who took it. For a new trial, three patients were selected at random. Find the probability that none of those patients had side effects.

  • math -

    prob side effect = 9/100
    prob of no side effects = 91/100

    prob that of three none has side effects
    = (91/100)^3 = .753571

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