simpangan baku dari data 1,3,7,4,6,5,2

→ Rata - rata :
= 1 + 3 + 7 + 4 + 6 + 5 + 2 / 7
= 28 / 7
= 4

→ Ragam :
= (1 - 4)² + (3 - 4)² + (7 - 4)² + (4 - 4)² + (6 - 4)² + (5 - 4)² + (2 - 4)² / 7

= (-3)² + (-1)² + (3)² + 0² + 2² + 1² + (-2)² / 7

= 9 + 1 + 9 + 4 + 1 + 4 / 7
= 28 / 7
= 4

→ Simpangan Baku :
= √ragam
= √4
= 2