Answer:
5 minutes
Step-by-step explanation:
If the mean arrival rate is 0.2 students per minute, the expected time interval between student arrivals, in minutes, is determined by the inverse of the arrival rate:
[tex]t = \frac{1}{\lambda}=\frac{1}{0.2}=5\ minutes[/tex]
The interval between student arrivals is, on average, 5 minutes.