What is an average lexile score for 6th graders?

it depends upon what exactly you mean by "lexile score".

averages are:

1)if you mean "phoneme score"(knowledge of the (sounds/graphemes) , it's about 98% (considering Words like <esquimeaux> for eskimo, or <quetzalcoatl> for ketzalcoatl, or <chic> for/sheek

2) if you mean the ability to understand individual English Words...8%

3) if you mean the ability to understand 6th grade Words...99%

4)if there is some number conjured by the school district, don't trust without verifying the units of comrehension that it represents.