Simpangan baku 1,4,4,5,5,6,7,8 adalah

langsung aja yy

X = (1+4+4+5+5+6+7+8) / 8
X = 40/8 = 5

maka

Sb = √ (1-5)²+2(4-5)²+2(5-5)²+(6-5)²+(7-5)²+(8-5)² / 8

Sb = √16+2+0+1+4+9 / 8

Sb = √ 32/8

Sb = √4

Sb = 2

semoga berguna +_+