The time between arrivals of vehicles at a particular intersection follows an exponential probability distribution with a mean of 12 seconds.  

Sketch this exponential probability distribution. f(x) 0.15 0.10 0.05 f(x) 0.15 0.10 0.05 5 5 10 10 15 15 20 25 20 30 30 f(x) 0.15 0.10 0.05 n 10 Screenshot 15 20 25 30 }(X) 0.15 0.10 0.05 5 10 15 20 25 30