Daryl's grade-equivalent score of 8.2 indicates what about his mathematics ability?

The correct answer indicates that Daryl's performance on the test aligns with what is expected from an average eighth-grader in the second month of the school year. A grade-equivalent score of 8.2 means that Daryl demonstrated the mathematical ability typical of a student completing the eighth grade during the second month. This score reflects not only his understanding of content appropriate for that grade level but also suggests he has the skills needed for that stage of learning.

In the context of grade-equivalent scores, these scores are not a direct representation of age but rather show how a student's abilities compare to the average of students in different grades. The notion of doing as well as average eighth-graders implies that Daryl has reached a level of proficiency in mathematics that is consistent with the typical achievement of students who are in eighth grade at the early part of the academic year. This information is crucial for understanding his current abilities and planning for his educational progress.