>>507629710These figures have been adjusted by two things the Flynn effect, and the(DeBerry, Scarr & Weinberg 1996) adjustment difficulties. Your source points this out. This is the data from the study.
7
-Black adoptees (children with two black biological parents): Average IQ of 96.8 (n=130).
-Interracial adoptees (one black and one white biological parent): Average IQ of 109.0 (n=143).
-White adoptees (for comparison, children with two white biological parents): Average IQ of 111.5 (n=25).
-National white average (used as a benchmark): 100.
-National black average (used as a benchmark): 85.
17
Black adoptees: Average IQ of 89.4 (n=94).
Interracial adoptees: Average IQ of 98.5 (n=55).
White adoptees: Average IQ of 106.1 (n=21).
National white average: 100.
National black average: 85.
7 with Flynn effect only
Adjusted black adoptee IQ: 88.7
Adjusted national black average: 76.9
Increase: 88.7 − 76.9 = 11.8 points (same as unadjusted: 96.8 − 85 = 11.8, since both are adjusted by the same amount).
17 with Flynn effect only
Adjusted black adoptee IQ: 84.0
Adjusted national black average: 79.6
Increase: 84.0 − 79.6 = 4.4 points (same as unadjusted: 89.4 − 85 = 4.4).
See how that is significantly different than the figure on Wikipedia?