simpangan baju dari data 1,3,8,9,4 adalsh

rata-rata = 1+3+8+9+4/5 = 25/5 = 5
variansi (S²) = (1-5)²+(3-5)²+(8-5)²+(9-5)²+(4+5)²/5
= (-4)²+(-2)²+(3)²+(4)²+(1)²/5
= 16+4+9+16+1/5
= 46/5 = 9,2
Simpangan baku (S) = √S² = √9,2 = 3,03