7.24 Customers arrive at a busy food truck according to a Poisson process with parameter it. If there are 1' people already in line, the customer will join the line with probability 1/ (i + 1). Assume that the chef at the truck takes, on average, 0: minutes to process an order. (a) Find the long-term average number of people in line. (b) Find the longterm probability that there are at least two people in line