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The first quartile of an ordered data set is the same as which percentile?
AThe 25th percentile
BThe 50th percentile
CThe 75th percentile
DThe 10th percentile
Answer & Solution
Correct answer: A. The 25th percentile
1. Quartiles cut ordered data into four equal parts and percentiles cut it into a hundred.
2. One quarter of the way through the data is 25 hundredths of the way through it.
3. The first quartile is therefore the same value as the 25th percentile, while 50 and 75 name the median and the third quartile.
_Source: OpenStax Introductory Business Statistics (CC BY 4.0), Ch 2 "Descriptive Statistics", section 2.2 Measures of the Location of the Data_
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