math
posted by karen .
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.

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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