No math whiz here, but I think that's why it's called an average. Yes, there are diferent size households, geography, lots of things that vary. That's why the number is an AVERAGE which takes into account all these factors. As with all stats, it's always about what you do with the number that gets tricky. In this case, I think the proper way to look at this number is how it compares historically, whether it's up or down, etc. Anything more than that will give you misleading connections. As you said, whatever the number is it will sound too low for a family of 15 in Manhatten, yet sound pretty good to a single person in TN. Uh..yeah...I understand what the word AVERAGE means. However, it's meaningless if you take the average of completely different sets of objects. This stat seems to have about as much meaning to me as taking the combined average speed of all horses, sloths, and humans.