Suppose the Time Intervals in Seconds Between Arrivals of Successive

Multiple Choice

Suppose the time intervals in seconds between arrivals of successive cars at an expressway tollbooth during rush hour are exponentially distributed with associated probability density function . Find the probability that the average time interval between arrivals of successive cars is more than 9 sec. Round your answer to four decimal places. ​

A) 0.1929
B) ​0.5564
C) ​0.9403
D) ​0.2366
E) ​0.0498