Simpangan baku dari data: 2,4,4,5,6,6,7,8,9,9 adalah?

Simpangan baku

2, 4, 4, 5, 6, 6, 7, 8, 9, 9

Rata - rata
= (2 + 4 + 4 + 5 + 6 + 6 + 7 + 8 + 9 + 9) / 10
= (60) / 10
= 6

S² = ( (2 - 6)² + (4 - 6)² + (4 - 6)² + (5 - 6)² + (6 - 6)² + (6 - 6)² + (7 - 6)² + (8 - 6)² + (9 - 6)² + (9 - 6)² ) / 6
= ( (16) + (4) + (4) + (1) + (0) + (0) + (1) + (4) + (9) + (9) ) / 6
= 48/6
= 8

Simpangan baku = √ragam
S = √S²
S = √8
S = 2√2