Question: Assume that after the first 12 hours, the average remaining useful life of a particular battery (before recharging is required) is 9 hours and that

Assume that after the first 12 hours, the average remaining useful life of a particular battery (before recharging is required) is 9 hours and that the remaining time is exponentially distributed. What is the probability that a randomly sampled battery of this type will last between 15 and 17 hours?

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