_31. A class of 20 students took a test. The standard deviation of the test scores is 0. Which of the following statements must be true about the test scores? A. All of the test scores are zero. B. All of the test scores are positive. C. Half of the test scores are positive and half of the test scores are negative. D. All of the test scores are the same.

MATLAB: An Introduction with Applications
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31. A class of 20 students took a test. The standard deviation of the test scores is 0.
Which of the following statements must be true about the test scores?
A. All of the test scores are zero.
B. All of the test scores are positive.
C. Half of the test scores are positive and half of the test scores are negative.
D. All of the test scores are the same.
Transcribed Image Text:31. A class of 20 students took a test. The standard deviation of the test scores is 0. Which of the following statements must be true about the test scores? A. All of the test scores are zero. B. All of the test scores are positive. C. Half of the test scores are positive and half of the test scores are negative. D. All of the test scores are the same.
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