Question

Simpangan baku dari data:3,4,4,5,6,6,7 adalah.....

Answer 1

Data: 3, 4, 4, 5, 6, 6, 7

⇒
(3 + 4 + 4 + 5 + 6 + 6 + 7) / 7
= 35/7
= 5

⇒
(3 - 5)² = (-2)² = 4
(4 - 5)² = (-1)² = 1
(4 - 5)² = (-1)² = 1
(5 - 5)² = (0)² = 0
(6 - 5)² = (1)² = 1
(6 - 5)² = (1)² = 1
(7 - 5)² = (2)² = 4

⇒
Σ(x - xi)²
= 4 + 1 + 1 + 0 + 1 + 1 + 4
= 12

⇒
Simpangan Baku
√((Σ(x - xi)²) / n)
= √(12/7)
= √1,71
= 1,30