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solve all parts (9 pts) 2 . The life, X, of a semiconductor laser at a constant power is normally distributed with a mean =7,000

solve all parts

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(9 pts) 2 . The life, X, of a semiconductor laser at a constant power is normally distributed with a mean =7,000 hours and a standard deviation o= 600 hours. (a) Find the probability that a laser has a life of more than r 6, 250 hours. ( b ) What is the life Xo such that 80% of the lasers have life that exceeds Xo

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