TRI-MEAN By N., Sam M.S. - 7 noun. a gauge of central tendency calculated as the median's and the upper and lower hinges of the distribution of cases. TRI-MEAN: "By the time we reach our first exam, you should all know how to compute the tri-mean." Related Psychology Terms SOCIAL CLASS (Social Stratification) ASTHENIC REACTION (Neurasthenia) WECHSLER MEMORY SCALE (WMS) CHILD PSYCHIATRY MANIC-DEPRESSIVE REACTION (GENERAL) ANTISOCIAL REACTION CHILD ABUSE (The Battered-Child Syndrome) MENTAL RETARDATION (PREVENTION, CARE, AND TREATMENT) FIVE-NUMBER SUMMARY DOMINANCE RELATIONSHIP Cite this page: N., Sam M.S., "TRI-MEAN," in PsychologyDictionary.org, April 29, 2013, https://psychologydictionary.org/tri-mean/ (accessed June 28, 2022).