Question: During the busiest time of the day, customers arrive at the Daily Grind Coffee House at an average of 15 customers per 20-minute period.
a. What is the probability that a customer will arrive within the next 3 minutes?
b. What is the probability that the time between the arrivals of customers is 12 minutes or more?
c. What is the probability that the next customer will arrive within 4 and 6 minutes?