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Australian Water Information Dictionary

first quartile

The first quartile of a set of numbers is the value in which 25% of the numbers are below it and 75% of the numbers are above it when the numbers are arranged in ascending (increasing) order.

Synonym: 25% quartile

This definition applies to:

• Glossary for Water forecasts: Seasonal streamflow
• Glossary for Water forecasts: Dynamic streamflow

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