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Verified answer
X = (12 + 10 + 9 + 11 + 13) / 5X = 55 / 5
X = 11
Sb = √(12-11)²+(10-11)²+(9-11)²+(11-11)²+(13-11)² / 5
Sb = √(1 + 1 + 4 + 0 + 4) / 5
Sb = √(10/5)
Sb = √2
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