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Poisson distribution

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An internal study by the Technology Services department at Lahey Electronics revealed
company employees receive an average of two emails per hour. Assume the arrival of
these emails is approximated by the Poisson distribution.
a. What is the probability Linda Lahey, company president, received exactly 1 email
between 4 P.M. and 5 P.M. yesterday?
b. What is the probability she received 5 or more email during the same period?
c. What is the probability she did not receive any email during the period?

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The solution contains the determination of various probabilities using Poisson distribution.

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