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Please help me to understand this problem: The time to failure (in hours) of fans in a personal computer can be modeled by an exponential

Please help me to understand this problem:

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The time to failure (in hours) of fans in a personal computer can be modeled by an exponential dish-ibution with 2' = 0-0005 . Round your answers to 4 decimal plaoes. (a) What proportion of fans will last at least IQDHU hours? (b) What proportion of Fans will last at most 3000 hours? (a) E (b) :l

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