Cynthia drives the same route to work on Monday through Friday. Her route includes one traffic light. According to the local traffic department this is a 55%

chance that the traffic light will be red when she arrives at the intersection on a

randomly selected workday. Suppose we choose 12 of Cynthia's workdays at

random and let X = the number of times that the light is red.

Explain why X is a binomial random sample