It's a statistic - representing a selection of goods/services, not your particular shopping pattern. Just because you happen to be a 6 foot tall US adult male,

It's a statistic - representing a selection of goods/services, not your particular shopping pattern. Just because you happen to be a 6 foot tall US adult male, doesn't mean that the claim that the average height of a US adult male is 5 foot 9 inches (according to google) is a lie.