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3. Suppose the lifetime of a spring has a Iognormal distribution with a mean of 7 hours and a standard deviation of 0.2 hours of

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3. Suppose the lifetime of a spring has a Iognormal distribution with a mean of 7 hours and a standard deviation of 0.2 hours of the normal random variable. a. What is the probability that a spring will last at least 1322 hours? b. What is the likelihood the spring will fail in the first 500 hours

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