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A research team at Cornell university conducted a study showing that approximately 10% of all business...

A research team at Cornell university conducted a study showing that approximately 10% of all business men who wear ties wear them so tightly that they actually reduce blood flow to the brain, diminishing cerebral function. at a board meeting of 20 businessmen, all whom wear ties, what is the probability that

a) at least one tie is too tight

b) at least 18 ties are not too tight

Math   Statistics-And-Probability   
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