Ragam (varians) dari data 6 5 5 6 4 5 4 adalah

jawab

xi = 4,4,,5,5,5,6,6,
n = 7
∑xi = 2(4) + 3(5) + 2(6) = 35
X= 35/7 = 5

ragam s²  = ∑(xi-x)²/ (n)
s² = 2(4-5)² + 3(5-5)²+ 2(6-5)² / (7)
s²= (2 + 0 + 2)/(7) = 4/7