varians dari data 10,12,12,15,14,14,,15,dan 12 adalah

jwab

xi = 10, 12,12,12, 14,14, 15,15
n = 8
∑xi = 10 + 3(12) + 2(14) + 2(15)= 104

X_ = 104/8 = 13

Variansi = S² =  ∑(xi -X_)² / n

∑(xi-X)² = (10-13)² + 3(12-13)² + 2(14-13)² + 2(15-13)²
= 9+ 3+ 2+ 4 = 18
s2 = 18/8 = 2,25