If customer interarrival times are exponentially distributed with mean 6 customers per hour--( please explain) a. There is a 21.3% chance that no customer arrives within 15 minutes.
b. There is a 35.8% chance that no customer arrives within 10 minutes.
c. There is a 5.0% chance that no customer arrives within 30 minutes.
Xd. There is a 2.7% chance that a customer arrives within 59 minutes.
e. There is a 60.7% chance that a customer arrives within 5 minutes.