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The lifetime in days of an electrical component follows a lognormal distribution defined by = 5 and = .25 D1. What is the mean lifetime

The lifetime in days of an electrical component follows a lognormal distribution defined by = 5 and = .25

D1. What is the mean lifetime of the components?

D2. What is the probability that a component will fail before 100 days?

D3. What is the probability that a component will last longer than 175 days?

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