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The service time at an automobile center has a Lognormal distribution with mean = 4 and σ = 0.5. What is the probability that a customer will have to wait for more than 6 hours? What is the probability that at least 8 of the next 10 customers will have to wait for more than 6 hours? What is the expected number of customers that will have to wait more than 6 hours?

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