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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
Standard deviation in grades? What does this mean? My lab teacher told us the average score of the class, which is: 135.2/200 and he then told us the standard deviation (which I forgot to write down) but it was in the mid-thirties/200, what does that mean?