Customers arrive at a department store checkout counter according to a Poisson distribution with a mean of 9 per hour. In a given two-hour period, what is the probability that 19 or more customers will arrive at the counter? (Round your answer to three decimal places.)
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The mean arrival rate \(\lambda\) is 9 customers per hour. For a 2-hour period, the mean number of arrivals is: \[ \lambda_{2\text{ hours}} = 9 \times 2 = 18 \] Show more…
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