airline travelers should be ready to be more flexible as airlines once again cancel thousands of flights this summer. the coalition for airline passengers rights, health, and safety averages 400 calls a day to help stranded travelers deal with airlines. suppose the hotline is staffed for 16 hours a day. a. calculate the average number of calls in a one-hour interval; 30-minute interval; 15-minute interval. (round your answers to 2 decimal places.)