There is a traffic light at the intersection of Main Street and Durham Avenue. The traffic light on Main Street follows a cycle.
It is green for 30 seconds, yellow for 5 seconds, and red for 25 seconds. As you travel along Main and approach the intersection, what is the probability that the first color you see is green?
Probability is defined as the number of desired outcomes over all possible outcomes. Lets say each second is one possible outcome. This means there is 30 different desired outcomes out of 60 possible outcomes. The probability therefore is 30/60, simplified to 1/2.
