Quartile1 Command

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Quartile1( <List of Raw Data> )
Determines the lower quartile of the list elements.
Example: Quartile1({1, 2, 3, 4}) yields 1.5.
Quartile1( <List of Numbers>, <List of Frequencies> )
Determines the lower quartile of the list elements considering the frequencies.
Example: Quartile1({1, 2, 3, 4}, {3, 2, 4, 2)) yields 1.


Note: GeoGebra uses the Moore & McCabe (2002) method to calculate quartiles, see http://mathworld.wolfram.com/Quartile.html
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