Final answer:
The question seems to be about onboard service charges for cruise-only and fly-aweigh bookings, but actually discusses survey results of onboard bills. For accurate service charge information, specific rates or policies from the cruise line are needed, which are not provided in the scenario.
Step-by-step explanation:
The question about the service charge for cruise-only and fly-aweigh bookings seems to revolve around additional fees or costs associated with these travel options. However, based on the information provided, it seems that the student is asking about an analysis of onboard bills from a survey rather than service charges.
As per the given scenario, cruise ships often handle transactions on a cashless basis. A survey was conducted on 60 single travelers and 70 couples to understand their onboard expenses during a seven-day cruise from Los Angeles to the Mexican Riviera. The summary of the bills for each group is to be analyzed to determine average expenditures, trends, or other economic insights that might be derived from the data. This analysis would include but is not limited to the total cost for the cruise, daily spending rates, and comparison between the expenses of single travelers and couples.
Without specific service charge rates given for cruise-only and fly-aweigh bookings, it's crucial to note that service charges can vary widely by cruise line, booking type, or ancillary services provided. To answer the student's question accurately, one would need exact figures or a policy outline from the cruise line in question.