diberikan data 6, 7, 8, 8, 10, 9 tentukan ragam dan simpangan baku

Cari rata-rata dahulu
Rata-rata
= 6+7+8+8+10+9/6
= 48/6
= 8

Variasi
S^2 = Sigma(xi - rata")^2/n
=(6-8)^2 + (7-8)^2 + (8-8)^2 + (8-8)^2 + (10-8)^2 + (9-8)^2/6
= (-2)^2 + (-1)^2 + 0^2 + 0^2 + 2^2 + 1^2/6
= 4+1+0+0+4+1/6
= 10/6
= 1,66

Simpangan Baku
√S^2 = √1,66 = 1,29