An internal study by Technology Services department at Lahey Electronics revealed company employees receive the average of 2 emails per hour. Suppose the arrival of these emails is approximated by Poisson distribution.
a. What is the probability Linda Lahey, company president, received exactly one email between 4 P.M. and 5 P.M. yesterday?
b. What is the probability she received five or more email throughout the same period?
c. What is the probability she did not receive any email throughout the period?