A medical care facility specializes in caring for minor injuries, colds, and flu. For the evening hours of 6-10 PM the mean number of arrivals is 4.0 per hour. What is the probability of exactly 2 arrivals in an hour? Select one: O a. 0.1200 O b. 0.4000 O C. 0.6500 O d. 0.1465 In probabilistic theory, the total number of all possible outcomes is called a Select one: O a, frequency O b. sample space O c permutation O d. combination Mean of binomial probability distribution is 857.6 and probability is 64% then number of values of binomial distribution is Select one: O a. 1040 O b. 1240 O c 1140 O d. 1340