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Suppose that the service life, in years, of LOUD WHISPER, a hearing aid battery, is a random variable having a Weibull distribution with the Scale

Suppose that the service life, in years, of "LOUD WHISPER", a hearing aid battery, is a random variable having a Weibull distribution with the Scale parameter =12 and the Shape parameter =1.4.

a. What is the probability the battery will fail between the second and fifth year?

b. At what point in time 10% of the batteries have died?

c. What is the hazard rate at the third year of operation?

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