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A grocery store counts the number of customers who arrive during an hour. The average over...

A grocery store counts the number of customers who arrive during an hour. The average over a year is 20 customers per hour. Assume the arrival of customers follows a Poisson distribution. (It usually does.)
Find the probability that at least one customer arrives in a particular one minute period. Round your answer to 3 decimals.
   
Find the probability that at least two customers arrive in a particular 4 minute period. Round your answer to four decimals.

Math   Statistics-And-Probability   
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