if we imagine that it is 1940 that William graduated from the college, then, the textbook will suggests that 4.6% of U.S. residents achieved William's level of educational attainment.
The level of education attainment explains the population of resident who have attained a certain education level.
According to the National Census, in 1940, only 4.6% of U.S. resident reached the College level of education.
Therefore, if we imagine that it is 1940 that William graduated from the college, then, the textbook will suggests that 4.6% of U.S. residents achieved William's level of educational attainment.
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