Suppose that the time to failure (in hours) of fans in a personal computer can be modeled by an exponential distribution with 2 = 0.0003. What proportion of the fans will last at most 10,000 hours? What proportion of the fans will last at least 7000 hours? a. 0.9502, 0.1225 O b.0.0498, 0.8775 O c. 0.0498, 0.1225 O d. NONE

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