On average a hematologist sees two new cases of acute myeloid leukemia each year. What is the average number of cases seen in three months? What is the chance the hematologist will see exactly four cases or four or more cases in the next three months? If, in fact, the hematologist does see four cases in the next three months, should he or she conclude that there is likely to be some new environmental factor responsible for these cases? POLI967