An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of four e-mails per hour. Assume the arrival of these e-mails is approximated by the Poisson distribution.
(a) What is the probability Linda Lahey, company president, received exactly one e-mail between 4pm and 5pm yesterday?
(b) What is the probability she did not receive any e-mail during this period?
(c) What is the probability she received ten or more e-mails during the same period?