simpangan baku dari data 6,4,5,6,5,7,8,7 adalah

→ Rata - Rata :
= 6+4+5+6+5+7+8+7 / 8
= 10 + 11 + 12 + 15 / 8
= 21 + 27 / 8
= 48 / 8
= 6

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

= (0)² + (-2)² + (-1)² + (0)² + (-1)² + (1)² + (2)² + (1)² / 8

= 0 + 4 + 1 + 0 + 1 + 1 + 2 + 1 / 8
= 10 / 8
= 5/4

→ Simpangan Baku :
= √ragam
= √5/4
= 1/2√5