1. (15 points). As a newly-hired dairy manager at Lonestar Dairy, one of your many tasks is to record and monitor incidence rates of infectious and metabolic diseases within your 6,000 cow herd. A common metabolic disease you observe is ketosis, where the cow's blood accumulated a large concentration of ketone bodies. Ketosis incidences (number of cows/month) for the last year are shown below. Answer the following questions based on this information:

Month	Ketosis Incidences
January	18
February	22
March	25
April	21
May	25
June	30
July	28
August	35
September	32
October	28
November	22
December	16

1. How many incidences would you expect to observe in one month? How did you come up with this estimate?
2. What is the probability of observing between 20 and 24 incidences in a month?