An Employee's Office Window Overlooks a Busy Four-Way Stop, and the Employee

Multiple Choice

An employee's office window overlooks a busy four-way stop, and the employee decides to track, per minute, the number of drivers who fail to stop. From data taken over many randomly selected times, the employee gets this probability model:

The expected number of drivers failing to stop, per minute, is:

A) 0.5.
B) 2.2.
C) 2)
D) 3)
E) varies from minute to minute.