The failure of a computer disk pack is considered to be an initial failure if it occurs prior to time t = α and a wear-out failure if it occurs after time t = β. Suppose the failure time distribution during the useful life of the disk pack is given by

a. Find F(t) and R(t).

b. Find the hazard rate z(t).

c. Graph the hazard rate of the disk pack for α = 100 hours and β = 1,500 hours.

d. For α = 100 and β = 1,500, what is the reliability of the disk pack at time t = 500 hours? What is the hazard rate?

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