On average, 24 customers per hour arrive in the checkout line of a clothing store (following a Poisson process). The service times of the store are exponentially distributed with an average of 2.3 minutes. When there are less than 5 customers in the checkout area (queue and attended), the store keeps only one box open. If there are from 5 to 9, then the store operates with two open boxes to pay. If there are more than 9 clients then open 3 boxes. 1. On average, how many customers are there in line? 2. What is the probability of having 2 or more open cash registers?