This is probably accurate given how our society really is structured. But following your thresholds:

- 61% of incomes are below lower middle

- 26% of incomes are lower middle (median being $61,822)

- 10% of incomes are middle

- 3% (nearly) of incomes are upper-middle

- <1% is remaining…

Data from https://dqydj.com/income-percentile-calculator/

Caveat, this is individual income, and you're talking about household income, so not quite the same for couples where both work.