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X = (11+12+13+14+15+16+17+18) / 8
X = 116/8 = 14,5
maka
Sb = √(11-14,5)²+(12-14,5)²+(13-14,5)²+(14-14,5)²+(15-14,5)²+(16-14,5)²+(17-14,5)²+(18-14,5)² / 8
Sb = √12,25+6,25+2,25+0,25+0,25+2,25+6,25+12,25 / 8
Sb = √ 42/8
Sb = √5,25
jadi simpangan bakunya yaitu √5,25
semoga berguna +_+