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?