The upper quartile of a set of data is represented by which of the following? the median of the upper quarter of the data. the mode of the upper half of the data. the median of the upper half of the data. the mode of the upper quarter of the data.

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?