30 Delivery trucks arrive independently at the Floorstore Regional distribution center with various consumer items from the company's suppliers. The mean num- ber of trucks arriving per hour is 20. Given that a truck has just arrived answer the following: a. What is the probability that the next truck will not arrive for at least 5 minutes? b. What is the probability that the next truck will ar- rive within the next 2 minutes? c. What is the probability that the next truck will arrive between 4 and 10 minutes