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Rashida is analyzing her students' test scores. For which data set would the median be a better choice as a measure of center rather than the mean?

a) 99, 95, 93, 90, 88, 92, 87, 91
b) 80, 83, 87, 84, 79, 81, 80, 77
c) 93, 95, 88, 38, 79, 85, 88, 90
d) 67, 72, 75, 74, 68, 69, 70, 65