Having or relating to two modes, peaks, or distinct values, especially in statistics when a data set has two most-frequently occurring numbers.
From bi- (two) + modal (relating to mode). Mode comes from Latin modus (measure/manner). The statistical term emerged in the 19th century.
Bimodal distributions are weird and interesting—when exam scores cluster at both high and low ends instead of spreading evenly, it often means two different groups took the test!
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