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3. In a medical experiment; a rat has been exposed to some radiation. The experimenters believe that the rat's survival time X (in weeks) has

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3. In a medical experiment; a rat has been exposed to some radiation. The experimenters believe that the rat's survival time X (in weeks) has the pdf zz?) : 3:172 I 3 e_(m) 1 1203 (a) What is the probability that the rat survives at least 100 weeks? U

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