An internal study by Technology Services department at Lahey Electronics revealed company employees receive average of 5.0 emails per hour. Suppose the arrival of these emails is approximated by the Poisson distribution.
What is the probability Linda Lahey, company president, received exactly 4 emails between 4 P.M. and 5 P.M. yesterday?
What is the probability she received 6 or more emails during the same period?
What is the probability she received four or less emails during the period?