Homework: C... Question 11, 5,3,90 HW Score: 73.96%, 8.88 of 12 points Save Part 1 of 3 Points: 0 of 1 Poisson probability formula is shown to the right, where X is the number of times the event occurs and ) is a parameter equal to the mean This distribution is often used to model the frequency with which a specified event occurs during a particular period of time. PX) pose that a hospital keeps records of emergency room traffic. These records reveal that the number of patients who arrive between 3 P.M. and 4 P.M. has a ison distribution with parameter > =8.3. Complete parts a through c. etermine the probability that, on a given day, the number of patients who arrive at the emergency room between 3 P.M. and 4 P.M. is exactly 5. P(X =5) = (Round to four decimal places as needed.)