Simpangan baki dari data 7,5,4,6,8 adalah

→ Rata - rata :
= 7 + 5 + 4 + 6 + 8 / 5
= 30 / 5
= 6

→ Ragam :
= (7 - 6)² + (5 - 6)² + (4 - 6)² + (6 - 6)² + (8 - 6)² / 5

= 1² + (-1)² + (-2)² + 0² + 2² / 5
= 1 + 1 + 4 + 4 / 5
= 10/5
= 2

→ Simpangan Baku :
= √ragam
= √2