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Question: the life x in years of a voltage regulator of...

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3.1-15. The life X (in years) of a voltage regulator of a a car has the pdf (x/7) 0 x oo. f(x) (a) What is the probability that this regulator will last at least 7 years? (b) Given that it has lasted at least 7 years, what is the conditional probability that it will last at least anothe 3.5 years?

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