Question: lucky lumen light bulbs have an expected life that is...
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
Please show all work