According to the U.S Census Bureau, there are 298,654,000 people in America. If we are looking for those who have the potential for doing well in mathematics, we must exclude chicks. Since this country is 51% or four fiftieths female, that leaves:

298,654,000 * (4/50) = 23,892,320 males

On the National Assessment of Educational Progress for the year 2000, the score for the 90th percentile was 350 out of 500. Since 90 percent is .9 we multiply the score by the percentile to get the proportion of males that do well in math:

350/500 * .9 = 0.63

Therefore, 63% of males are above the high water mark which makes 100% – 0.63 = 99.34% of males not good at math.

23,892,320 * 99.34% = 23,734,630 might as well be girls

Extrapolating the results to American population

Since only one third of the people in this country are in school, that makes:

298,654,000 / 3 = 99,551,333 Americans in school

99,551,333 * 99.34% = 98,894,294 not good in math

Adding this number to the population to find out the proportion yields 397,548,294 which is roughly 4/3 of the American public that is not good at Math.

Q.E.D.