1/5 doesn't really say anything about distribution on its own. Maybe the 1/5 are all 70+ or maybe they're all on the west coast or all on the east coast. Or may

1/5 doesn't really say anything about distribution on its own. Maybe the 1/5 are all 70+ or maybe they're all on the west coast or all on the east coast. Or maybe it's all low-income. There are lots of ways something can affect a huge percent of people and yet you never see it.