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The length of time for one individual to be served at a cafeteria is a random...

The length of time for one individual to be served at a cafeteria is a random variable having an exponential distribution with a mean of 4 minutes. What is the probability that a person is served in less than 3 minutes on at least 4 of the next 6 days? (note – this is similar to a question we did in class today and you need to use both the periodic and binomial distributions).

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