simapangan baku dari data 3,4,4,5,5,7,7 adalah

X = (3 + 4 + 4 + 5 + 5 +7 + 7) / 7
X = 35 / 7
X = 5

Sb = √(3-5)²+2(4-5)²+2(5-5)²+2(7-5)² / 7
Sb = √(4+2+0+8) / 7
Sb = √14/7
Sb = √2

Semoga berguna +_+

Materi Statistika

Mencari rata-rata data:
[tex] x = \frac{3+4+4+5+5+7+7}{7} = \frac{35}{7} = 5 [/tex]
Mencari simpangan baku
[tex]Sb = \frac{(3-5)^2 + 2(4-5)^2 + 2(5-5)^2 + 2(7-5)^2}{7} = \frac{14}{7} = 2 [/tex]