The time to failure (in hours) for a laser in a cytometry machine is modeled by an exponential distribution with = 0.00004. Round the answers to 3 decimal places. (a) What is the probability that the laser will last at least 20457 hours? i 0.368 (b) What is the probability that the laser will last at most 30608 hours? i 0.701 (c) What is the probability that the laser will last between 20457 and 30608 hours? i 0.069