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S = √(∑(xi - Xrata)/ ( n-1)
S = √ (1-3,5)² + (2-3,5)² + ... + (6-3,5)² / (6-1)
S = √6,25 +2,25+0,25+0,25+2,25+6,25 / 5
S=√17,5 / 5
S =√3,5 = 1,87