An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of two non-work-related 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 non-work-related e-mail between 4 p.m. and 5 p.m. yesterday?
b. What is the probability she received five or more non-work-related e-mails during the same period?
c. What is the probability she did not receive any non-work-related e-mails during the period?