The time to failure (in hours) for a laser in a cytometry machine is modeled by an

Question:

The time to failure (in hours) for a laser in a cytometry machine is modeled by an exponential with λ = 0.00004.
(a) What is the probability that the laser will last at least 20,000 hours?
(b) What is the probability that the laser will last at most 30,000 hours?
(c) What is the probability that the laser will last between 20,000 and 30,000 hours? Distribution
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