Automobiles arrive at the Elkhart exit of the Indiana Toll Road at the rate of two per

Question:

Automobiles arrive at the Elkhart exit of the Indiana Toll Road at the rate of two per minute. The distribution of arrivals approximates a Poisson distribution.
a. What is the probability that no automobiles arrive in a particular minute?
b. What is the probability that at least one automobile arrives during a particular minute?

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