simpangan baku dari kata 8,3,2,7,7,9

8+3+2+7+7+9 / 6 = 36/6 = 6

Ragam :
= (8-6)²+(3-6)²+(2-6)²+(7-6)²+(7-6)²+(9-6)² /6
= (2)²+(-3)²+(-4)²+(1)²+(1)²+(3)² / 6
= 4 + 9 + 16 + 1 + 1 + 9 / 6
= 40 / 6
= 6,666

Simpangan baku
= √ragam
= √6,666
= 2,58