Average test scores are used in special education evaluations and in teacher-made tests in the classroom. They are determined by adding a set of numbers and dividing the sum by the total number of numerals used in calculating that sum. These kinds of scores are used to determine the "middle" of a group of test scores.
Statistically, approximately 68 percent of any large group of students will score within the low average to high average range on most tests. The exact average score itself reaches the 50th percentile.
Educators use averages to:
- Monitor the rate at which the class is learning the material;
- Estimate where individual students' scores lie in relation to the rest of the class; and
- Estimate individual students' abilities as compared to nationally normed achievement tests, such as those used to diagnose learning disabilities or on teacher-made tests.