QUESTION 9 The Regency Hotel has enough space at its entrance for four taxicabs to line up, walt for guests, and then load passengers. Cabs arrive at the hotel every 6 minutes; if a taxi drives by the hotel and the line Is full, it must drive on. Hotel guests require a taxi every 5 minutes, on average. It takes a cab driver an average of 5 minutes to load passengers and luggage and leave the hotel (exponentially distributed). The average time a cab must wait for a fare (Wq) is _ and the probability that the line will be full when a cab drives by, causing it to drive on is O 21 minutes; 43% 21 minutes; 94% 31 minutes; 43% 31 minutes; 94% O none of the above