) If the value of ? = 0.8 and d = 400, determine the probability that a packaged disk fails before 400 hours? (Round your answer to 4 decimal places.)

Assume the life of a packaged magnetic disk exposed to corrosive gases has a Weibull distribution.(a) Using parameters ? = 0.5 and the mean life of 600 hours, determine the value of ?.(b) If the value of ? = 0.6 and d = 200, determine the probability that a packaged disk lasts at least 500 hours. (Round your answer to 4 decimal places.)(c) If the value of ? = 0.8 and d = 400, determine the probability that a packaged disk fails before 400 hours? (Round your answer to 4 decimal places.)

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