Quartile3 Command

Quartile3( <List of Raw Data> ): Determines the upper quartile of the list elements.

Quartile3({1, 2, 3, 4}) yields 3.5.

Quartile3( <List of Numbers>, <List of Frequencies> ): Determines the upper quartile of the list elements considering the frequencies.

Quartile3({1, 2, 3, 4}, {3, 2, 4, 2}) yields 3.

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