SAT Math· difficulty 5/5
Set X has values clustered tightly around 50. Set Y has values widely spread between 10 and 90 with mean 50. Both sets have 10 values. Which is true?
Set X has greater SD than Set Y.
SD cannot be determined without exact values.
Set Y has greater SD than Set X.
Both have the same SD.
Explanation
SD measures spread around the mean. Set Y is more spread out, so it has a larger SD.
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