Probabilities of a Semiconductor Laser at a Constant Power

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Question

The life of semiconductor laser at a constant power is normally distributed with a mean of 7000 hours and a standard deviation of 600 hours.

What is the probability that a laser fails before 5000 hours?
What is the life in hours that 95% of the lasers exceed?

Summary: This question belongs to mathematics and discusses about probability operations.

Total Word count: 30

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