di ketahui data 2,4,5,7,7,8,9 nilai variansi data tersebut adalah

jawab
xi = 2,4,5,7,7,8,9
n = 7
∑xi= 42
X= 42/7= 6

Variansi = s² = ∑(xi-x)²/n
s² = {(2-6)²+(4-6)²+ (5-6)²+ 2(7-6)²+ (8-6)²+(9-6)²}/ (7)
s²  =  (16+4+1+2+4+9)/7= 156/7=22,29