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After constructing a relative frequency distribution summarizing IQ scores of college students, what should be the sum of the relative frequencies?
a. If percentages are used, the sum should 1%. If proportions are used, the sum should be 100.
b. If percentages are used, the sum should be 0%. If proportions are used, the sum should be 0.
c. If percentages are used, the sum should be 100%. If proportions are used, the sum should be 1.
d. If percentages are used, the sum should be 100%. If proportions are used, the sum should be 100.
