Which statement best defines quartile?

• A. A division of the total into four segments
• B. A division of the total into four equal parts
• C. The fourth item in a list
• D. A quarter note value

Answer: (B)

Quartiles are values that divide a ranked data set into four equal parts. When data are ordered from smallest to largest, the quartiles mark the boundaries that separate the 25%, 50%, and 75% positions, so each of the four parts contains roughly the same number of data points. This makes the option describing a division into four equal parts the most accurate reflection of what a quartile represents. The other choices aren’t correct because a quartile isn’t just any division into four segments (the parts must be equal), it isn’t about a position in a list, and it has nothing to do with music notation.