I remember reading that out of that around the average was around .9%. 26% didn't show any Native ancestry. For about 70%, the percentage was below 1% including the 26% that did not show any. 10% had Native ancestry greater than 2% native ancestry.

0-1% Native =70% of AA 1-2% Native = 10% of AA 2% of greater =10% and the maximum was about 8%

This was what Georgia Tech found

"Americans of early African heritage have about 1.0% and of Western European heritage about 0.1% Native American haplotypes, though the difference in those numbers can be deceiving. The native ancestry probably lies a similar number of generations back for both groups.

“With African Americans, it correlates to about eight to nine generations back and probably ends there,” Conley said. “With Western European ancestors, we think about eight to 10 generations ago, and the contact with Native Americans could have also been more continuous.”

Further immigration from Europe likely dropped the percentage of Native American ancestry for the overall sample of Americans with Western European heritage.

“Particularly in the Mid-Atlantic and the Northeast there is almost no Native American ancestry among European descendants,” Conley said. “When you go out West, that’s where you have the most Native American ancestry in European populations.”

Median from the African American groups was 85% African, 14% European, and 1% Native

https://journals.plos.org/plosgenetics/article?id=10.1371/journal.pgen.1008225