17.5.4 The failure time of a light bulb in days is modeled as a Weibull distribution with parameters a = 2.5 and λ = 0.01. (a) What is the probability that a light bulb is still operating after 120 days? (b) What is the probability that a light bulb fails within 50 days? (c) What is the median failure time of a light bulb? (d) What is the hazard rate? (e) How much more likely to suddenly fail is a light bulb operating after 120 days

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