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August 29, 2015

Homework Help: Biostatistics

Posted by Cathy on Saturday, June 8, 2013 at 11:40am.

Test the potency of a drug on 20 rats. Previous animal show that a 10-mg dose of drug is lethal 5% of the time within 1st 4 hours; of the animals alive at 4 hours, 10% will die in the next 4 hours. What is the probability that 3 or more rats will die in the first 4 hours.

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