Drivers Arrive at a Toll Booth at a Rate of 3

Multiple Choice

Drivers arrive at a toll booth at a rate of 3 per minute during peak traffic periods.The time between consecutive driver arrivals follows an exponential distribution.What is the probability that it will take less than 1/2 of a minute between consecutive drivers?

A) 0.167
B) 0.223
C) 0.777
D) 0.5