A certain type of device has an advertised failure rate of 0.004 per hour. The failure rate is constant and the exponential distribution applies. (a) What is the mean time to failure? (b) What is the probability that 1000 hours will pass before a failure is observed? (a) The mean time to failure is hours. (Type an integer or a decimal. Do not round.) (b) The probability that 1000 hours will pass before a failure is observed is . (Round to four decimal places as needed.)
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004 per hour Mean = 1 / 0.004 = 250 hours Show more…
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