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Martin runs a hot dog stand, and it opens between 8:00 a.m. and 6:00 p.m. from Monday to Friday. Customers arrive at the stand according

Martin runs a hot dog stand, and it opens between 8:00 a.m. and 6:00 p.m. from Monday to Friday.  Customers arrive at the stand according to a Poisson distribution with an average of 18 customers per hour.  Find the probability that at least 20 customers arrive in the next hour.  (Round to 3 decimal places.)

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