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A standard score of 100 on a standardized test of math or reading would also be average. As a standard score gives a position in relationship to a reference group, the score by itself is meaningless without knowing the position of the student when compared to all students who took the same test. A standard score of 90, the beginning of the average range, corresponds to a percentile rank of 25. A standard score of 110, the uppermost end of average, has a percentile range of 75. So a child at the 30 th percentile on a test of reading or math is performing within the region of what would be considered âaverage.â
1. Odd-numbered T scores fall between Standard Scores. For instance, a T score of 49 is equivalent to a z-score of -0.10, and a standard score of 98.5. Stanford-Binet Intelligence Scale, 4 th ed. and Other Tests Using Standard Scores with a Mean of 100 and SD 16 . Z-scores (z), Percentile Ranks (PR), Composite and Area Standard Scores (SAS [1]) (Mean = 100 s.d. = 16), Subtest Standard Scores (sas) (Mean = 50, s.d. = 8), and Stanines (9)