Lognormal distribution with a mean, Basic Statistics

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Lognormal distribution with a mean

The length of time for one individual to be served at a cafeteria is a random variable having a lognormal distribution with a mean of 10 minutes and standard deviation of 2 minutes. What is the probability that a person will be served in less than 9 minutes on at least 3 of the next 7 days?

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Basic Statistics: Lognormal distribution with a mean

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