11.3. A commuter airline overbooks all of its flights by one passenger (i.e., the ticket agent will take seven reservations for an airplane that has only six seats). The no-show experience for the past 20 days is shown below: No-shows= 0 1 2 3 4 Frequency= 6 5 4 3 2

Using the critical fractile P(d < x) Cu/(Cu + Co), find the maximum implied overbooking opportunity loss Co if the revenue Cu from a passenger is $20.