for j 1, 2, 3, where Sj is the event that a driver is stopped by the jth light. We
assume a ‘one-light’ memory for the system. By means of the tree diagram,
determine the probability that a driver:
(a) Will be delayed by all four lights.
(b) Will not be delayed by any of the four lights.
(c) Will be delayed by at most one light.Basic Probability Concepts 35