The lifetime (in hours) of a semiconductor laser has a lognormal distribution with 0 = 9 and @ = 1.5. Determine the following in parts (a) and (b): a) Probability the lifetime is less than 1000 hours Round your answer to three decimal places (e.g. 98.765). P = b) Probability the lifetime is less than 11000 hours given that it is more than 10000 hours Round your answer to three decimal places (e.g. 98.765). P = i

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