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 7.1%.
What is the probability that an automobile will not run a red light at that intersection on a given day?
The probability that an automobile going through the intersection will run a red light is 7.1%. Therefore, the probability that it will not run a red light is 100% - 7.1% = 92.9%.
Therefore, the probability that an automobile will not run a red light at that intersection on a given day is 92.9%.