Diketahui data 4 , 8, 10, 14 , 14, 16, 18 nilai variasi data tersebut adalah ..?

jawab

xi = 4,8, 10, 14, 14, 16, 18
∑xi= 84
n = 7
X_  = 84/7 = 12

Varians =S² = (1/n) ∑|xi-X_|²

s² = 1/7 [ (4-12)² + (8-12)² +(10-12)²+ 2(14-12)² +(16-12)²+(18-12)² ]

s² = 1/7 [64  + 16 + 4 + 2(4) + 16 + 36]

s² = 1/7  (144) = 144/7 = 20,57