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Question: lucky lumen light bulbs have an expected life that is...

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Lucky Lumen light bulbs have an expected life that is exponentially distributed with a mean of 20,000 hours. Determine the probability that one of these light bulbs will last:

1. At least 20,000 hours

2. No longer than 4000 hours

3. Between 4,000 and 24,000 hours

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