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Quartiles. The 25th, 50th and 75th percentile points. (See
definition of Percentile.)
Range (of a set of data). The numerical difference between
the largest and smallest values in a set of data.
Rational number.
A number that can be expressed as the
ratio, or quotient, of two integers, a/b, provided b 0. Rational
numbers can be expressed as common fractions or decimals, such
as 3/5 or 0.6. Finite decimals, repeating decimals, mixed numbers
and whole numbers are all rational numbers. Nonrepeating decimals
cannot be expressed in this way, and are said to be irrational.
Real numbers.
All the numbers which can be expressed as
decimals.
Real-world problems. Quantitative and spatial problems
that arise from a wide variety of human experiences, applications
to careers. These do not have to be highly complex ones and can
include such things as making change, figuring sale prices, or
comparing payment plans.
Rectangular coordinate system. This system uses two (for
a plane) or three (for space) mutually perpendicular lines (called
coordinate axes) and their point of intersection (called the origin)
as the frame of reference. Specific locations are described by
ordered pairs or triples (called coordinates) that indicate distance
from the origin along lines that are parallel to the coordinate
axes.
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