Use the data set {-2, -3, 1, 8} to answer the following question(s).The mean of the data set is
A. 3.5.
B. 0.25.
C. 4.
D. 1.
E. none of these
Answer: D
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Find the domain of the rational expression. 
A. {x|x is a real number and x ? 8 and x ? -5} B. {x|x is a real number and x ? 8 and x ? 5} C. {x|x is a real number and x ? 8 and x ? -8 and x ? -5} D. {x|x is a real number and x ? 8 and x ? -8 and x ? 5}
Solve the problem.A data-recording thermometer recorded the soil temperature in a field every 2 hours from noon to midnight, as shown in the following table. Use the Trapezoidal Rule to estimate the average temperature for the 12-hour period. Round your answer to the nearest hundredth if necessary.
A. 79.1°F B. 76.67°F C. 65.92°F D. 65.94°F
Rationalize the denominator.
A. 1
B. 5
C. 
D. 5
Compute r, the linear coefficient of correlation, for the given data.Two separate tests are designed to measure a student's ability to solve problems. Several students are randomly selected to take both tests and the results are shown below.
A. 0.109 B. 0.867 C. 0.548 D. 0.714