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suppose that the service life, in years, of the LOUD WHISPER a hearing aid battery is...

suppose that the service life, in years, of the LOUD WHISPER a hearing aid battery is a random variable have a weibull distrubtuion with scale parameter =.7 and the shape parameter = 2.1

A- what is the probability that the battery will fail between the first and third year

B- at what point in time, 30% of the batteries died?

Math   Statistics-And-Probability   
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