Simpangan baku dari data 10, 12, 14, 16, 18 adalah

→ Rata - rata :
= 10 + 12 + 14 + 16 + 18 / 5
= 70 / 5
= 14

→ Ragam :
= (10 - 14)² + (12 - 14)² + (14 - 14)² + (16 - 14)² + (18 - 14)² / 5
= (-4)² + (-2)² + 0² + 2² + 4² / 5
= 16 + 4 + 0 + 4 + 16 / 5
= 40 / 5
= 8

→ Simpangan Baku :
= √ragam
= √8
= √4 x 2
= 2√2