Jisho

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へんさち 偏差値
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Noun
1. deviation value (usu. scaled to mean of 50, standard deviation of 10, and often used for academic grades); deviation; T-score; standard score​
Wikipedia definition
2. Standard score​In statistics, a standard score indicates by how many standard deviations an observation or datum is above or below the mean. It is a dimensionless quantity derived by subtracting the population mean from an individual raw score and then dividing the difference by the population standard deviation. This conversion process is called standardizing or normalizing; however, "normalizing" can refer to many types of ratios; see normalization (statistics) for more.
Read “Standard score” on English Wikipedia
Read “偏差値” on Japanese Wikipedia
Read “Standard score” on DBpedia

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