3 / 3 7. During a teacher's travels to school she counts 16 traffic lights. She estimates that there is a 30% probability that she must stop at any one of these lights. [5] Random Variable X: Type of Distribution: a) Determine the probability that the 5th light is the first time that she is required to stop. b) Determine the average number of traffic lights she will be able to go through before having to stop