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 lasta. At least 24,000 hoursb. No longer than 4,000 hoursc. Between 4,000 hours and 24,000 hours

A First Course in Probability (10th Edition)
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Chapter1: Combinatorial Analysis
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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
a. At least 24,000 hours
b. No longer than 4,000 hours
c. Between 4,000 hours and 24,000 hours

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