tolong dibantu 1.Simpangan baku dari data 6,5,7,3,dan 9 adalah a.5 b.4 c.3 d.2 e.1

Data: 3, 5, 6, 7, 9

⇒
(3 + 5 + 6 + 7 + 9) / 5
= 30/5
= 6

⇒
(3 - 6)² = (-3)² = 9
(5 - 6)² = (-1)² = 1
(6 - 6)² = (0)² = 0
(7 - 6)² = (1)² = 1
(9 - 6)² = (3)² = 9

⇒
Σ(x - xi)²
= 9 + 1 + 0 + 1 + 9
= 20

⇒
Simpangan Baku
√((Σ(x - xi)²) / n)
= √(20/5)
= √4
= 2