US wealth by wealth percentile group. 50% of households own 2.5% of the nation’s wealth.
(lemmy.world)
Source: Federal Reserve
Multiply the population by the percentage? (I didn't find anything on that page suggesting that it wouldn't be the case.)
342 million * 0.5 = 171 million people who are in the bottom yellow line. The top darker green line is 342 million * 0.001 = 342 thousand people
I think you can do the others yourself if you like.