The director of graduate admissions is analyzing the relationship between scores in the Graduate Record Examination (GRE) and student performance in graduate school, as measured by a student's GPA. The table below shows a sample of 10 students. 
(See the Excel Data File.) The covariance is ________.
Definitions:
Specific Heat
The amount of heat energy that must be supplied to raise the temperature of 1 gram of a substance by 1°C.
Heat of Fusion
The amount of heat required to convert a solid at its melting point into a liquid without changing its temperature.
Homeostasis
The regulatory process by which biological systems maintain a stable internal environment despite external changes.
Vaporization
The phase transition of a substance from a liquid to a gas, occurring through the processes of evaporation or boiling.
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