Red lights. A city finds empirically that an automobile going through the intersection of 5th and Main will run a red light sometime during a given day with probability 8.9%.

Question

What is the probability that an automobile will not run a red light at that intersection on a given day?

Answer 1

The probability of an automobile not running a red light at the intersection of 5th and Main is the complement of the probability of running a red light, which is 1 - 0.089 = 0.911 or approximately 91.1%.