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The tables give the distribution of grades for 21 students in two different college mathematics classes. For purposes of making statistical calculations, A=4, B=3, C=2, D=1, and F=0. Which of the following statements is true about the data shown for these two classes? I. The standard deviation of grades is greater for class X. II. the standard deviation of grades is greater for class Y. III. The median letter grade is the same for classes X and Y. |
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Answer» I only |
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