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The life of a computer processing unit (CPU) is modelled by a Weibull distribution with parameters...

The life of a computer processing unit (CPU) is modelled by a Weibull distribution with parameters β = 3 hours and δ = 900 hours.           

            a.         What is the proportion that the CPU fails before 500 hours?

b.         What is the proportion that the CPU fails between 500 hours and 600 hours?

  1. What is the hour that separates the top 25% of long-lasting CPUs?
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