1. The problem statement, all variables and given/known data Assume that in a traffic junction, the cycle of the traffic signal lights is 2 minutes of green (vehicle does not stop) and 3 minutes of red (vehicle stops). Consider that the arrival time of vehicles at the junction is uniformly distributed over 5 minute cycle. The expected waiting time (in minutes) for the vehicle at the junction is __________. 2. Relevant equations E(x) = summation of (x) * P(x) over all values of x 3. The attempt at a solution Adding them all I get answer for expected value as 1 / 25 * (6 + 6 + 6 + 5 + 3 ) = 26/25 Correct answer is 0.9. How do I solve this?