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4-69. The life of a semiconductor laser at a constant power is normally distributed with a mean of 7000 hours and a stan
Posted: Mon Nov 15, 2021 10:11 am
by answerhappygod
- 4 69 The Life Of A Semiconductor Laser At A Constant Power Is Normally Distributed With A Mean Of 7000 Hours And A Stan 1 (28.38 KiB) Viewed 139 times
4-69. The life of a semiconductor laser at a constant power is normally distributed with a mean of 7000 hours and a standard deviation of 600 hours. (a) What is the probability that a laser fails before 6000 hours? (b) What is the life in hours that 95% of the lasers exceed? (c) If three lasers are used in a product and they are assumed to fail independently, what is the probability that all three are still operating after 7000 hours?