Suppose that the service life in hours of a semiconductor is a random variable having a Weibull

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Suppose that the service life in hours of a semiconductor is a random variable having a Weibull distribution (see Exercise 6.23) with α = 0.025 and β = 0.500.
(a) How long can such a semiconductor be expected to last?
(b) What is the probability that such a semiconductor will still be in operating condition after 4,000 hours?
Distribution
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