Marge and xavier are eating dinner in a crowded restaurant. marge hears the people at the next table talking about the upcoming election; xavier does not. why marge hears the people talking and xavier does not is best explained by

This scenario is one example of the Signal Detection Theory. It can be that Marge is interested with the topic of the upcoming election that is why she was able to pick up the conversation despite the background noise in the restaurant. This is also why Xavier was not able to hear that conversation.