The Michigan Bridge charges $5 for passenger cars and $15 for all other vehicles. Suppose that during daytime hours, 70% of all vehicles are passenger cars. If 30 vehicles cross the bridge during a particular daytime period, and let X be the number of passenger cars during this period. (1) What kind of distribution is X? (2 points) 2) What are its parameters? (2 points) (3) What is the expected toll revenue during this period? (6 points) Hint: the toll revenue is a linear function of X