A professor grades 120 research papers and reports that the average score was 80%. What do we know about the sum of the differences of these 120 scores from their mean of 80%?
A. The sum of the differences is minimal.
B. The sum of the differences is 80%, the same as the mean.
C. The sum of the differences is equal to zero.
D. It is impossible to know without knowing each of the 120 scores.
Ans: C
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