That’s not true. It’s not that the average American reads at a 4th grade level, it’s that enough of people read at less than a 5th grade level (about 20%) that

That’s not true. It’s not that the average American reads at a 4th grade level, it’s that enough of people read at less than a 5th grade level (about 20%) that you have to take them into account when targeting a general audience.