You correctly found the mean age of the data set for the 6 p.m. time in the food court. However, the mean age of the data set for the 1 p.m. time is about 42, so there will probably be more people in the food court at that time who might buy Hawaiian cruises. Also, the mean or average could be misleading. There could be many people who are old and many who are young, with an average age around 26, for example, without anyone actually being around the age of 26.