Suppose that the number of patients arriving at an emergency room is N, each of which is classified into two types (A and B). Type A are those who require assistance in no more than 15 mins and type B no more than 30 mins. It has been estimated that the probability of type A patients that the emergency room receives per day is p. Determine, using conditional expectation properties, on average how many type B patients are seen in the emergency room.
