Varians (Ragam) dari data 4,5,4,6,2,9 adalah?

rerata = (4+5+4+6+2+9)/6 = 5
jumlah kuadrat tiap simpangan:
Σ[i=1, 6] (xi - rerata)²
= (4-5)² + (5-5)² + (4-5)² + (6-5)² + (2-5)² + (9-5)²
= 1 + 0 + 1 + 1 + 9 + 16

= 28
Ragam
= 1/6 * (28)
= 4,667