/sci/ - Science & Math

I gotta big brained question here.
There were 2,813,503 deaths in the US in one year.
The life expectancy was 78.6 years.
So a randomly chosen person has a 1 in 78.6 probability of dying on a given year, right? So for every death there should be 77.6 people that don't die, right?
But if you figure it out, the US population would only be around 221 million. I'm off by 50% which is a lot.