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My suspicious eye is attracted to the words “Percent of subpopulation.”
I think there is mischief represented there.

Yes. Weird wording for a chart like that. Let’s look at the trickery with some made up numbers.

Say, for example that of 100 adults:
60 are white of which 6 (10%) are illiterate
20 are black of which 2 (10%) are illiterate
10 are Latino of which 1 (10%) is illiterate
10 are Asian of which 1 (10%) is illiterate

But by looking at the “subpopulation” of only illiterate people you would find that:

Of the 10 illiterate people:
6 are white: 60% of subpopulation
2 are black: 20% of subpopulation
1 is Latino: 10% of subpopulation
1 is Asian: 10% of subpopulation