Solution: The life of a semiconductor laser at a constant power is normally distributed
Chapter 4, Problem 4-140(choose chapter or problem)
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 5,800 hours? (b) What is the life in hours that 90% of the lasers exceed?
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