X, the time between аrrivаls tо аn ATM, has the expоnential pdf with mean equal tо 2 minutes. This question is copywritten by Dr. L. Chattin and is part of a quiz or exam given at Arizona State University. It may not be posted or reproduced without permission from Dr. L. Chattin. The probability that there are 5 or fewer arrivals in a 12-minute period is _________. Select the answer closest to yours.