Yes, look up what per capita means.

i have 4 boxes labeled A to D, and 10 rocks.

i put 1 rock in A, 2 in B, 3 in C and 4 in D.

A[⚪] B[⚪⚪] C[⚪⚪⚪] D[⚪⚪⚪⚪]

i then paint 1 rock in B, 2 rocks in C and 1 rock in D.

A[⚪] B[⚪🔴] C[⚪🔴🔴] D[⚪⚪⚪🔴]

then i put the boxes in a bigger box called the united boxes.

here's the rate of painted rocks:

1. C 66% (2/3)
2. B 50% (1/2)
3. United boxes 40% (4/10)
4. D 25% (1/4)
5. A 0% (0/1)

Thats how averages work, unlike eg maximums.

But Im sure reversing that chart would correlate with math test scores.

The US average falls in the middle of the list of states, yes. This is a chart of per capita rates.

The entire US would have the average of all the states' incarceration rates.