Final answer:
The question does not provide a specific duration for an average meal time for parties of 2 or 4 at a campus restaurant, and it would require more data or an observational study to accurately determine this figure. Influencing factors may include wait time for seating, service speed, eating, and socializing, along with the students' class schedules.
Step-by-step explanation:
The question does not provide a specific number of minutes that the average meal lasts for parties of 2 or 4. However, from the context given, we can infer that certain factors are affecting the length of meal times for students at the campus restaurant.
If we consider the provided data such as the 90th percentile of wait time being 13.5 minutes, and that one customer arrives every two minutes on average, we can hypothesize that the average meal time is likely to be more than this amount, taking into consideration the time it takes to find seating, order, eat, and possibly interact with friends.
Without concrete numerical data to establish an average meal duration, I'd recommend looking for additional statistics or conducting an observational study to determine the typical duration of a meal during this time of the day for parties of 2 or 4. Potential factors could include the time it takes to be seated, order the meal,
the speed of service, and the dining habits of the students. This would account for both the time spent eating and any socializing that might occur. It's also relevant to take into account that the timing of the meal is between classes and might be influenced by the students' schedules.