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 Quartiles:  When data in a set are arranged in order, quartiles are the numbers that split the data into quarters (or fourths).

First Quartile at Harcourt Brace: Read a description of first quartile.

Second Quartile at Harcourt Brace: Read a description of second quartile.

Third Quartile at Harcourt Brace: Read a description of third quartile.