Varian ragam ragam dari data 11,15,13,12=14,13,14,12

jawab

xi  = 11, 15, 13, 12, 14, 13, 14, 12
n = 8
∑xi = 104
X = ∑xi / (n) = 104/8 = 13

S² = ∑ |xi - X|² / (n)

S² = { (11-13)² +(15-13)² +(13-13)² +(12-13)² +(14-13)²+ (13-13)²+(14-13)² +(12-13)²)/8

s² = (4 + 4+0+1+1+0+1+1) /8 =  12/8
s² = 1,5