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dik:
n(jumlah data) = 5
pertama cari rata-rata (mean) dulu:
1/n (6 + 7 + 7 + 7 + 8)
= 1/5 (35)
= 7
masukkan rumus simpangan baku:
S² = 1/n Σ(xi - xmean)
S² = 1/5 [(6 - 7)² + (7 - 7)² + (7 - 7)² + (7 - 7)² + (8 - 7)²]
S² = 1/5 [(-1)² + (0)² + (0)² + (0)² + (1)²]
S² = 1/5 (1 + 0 + 0 + 0 + 1)
S² = 1/5 (2)
S² = 2/5
S = √(2/5) atau √2 / √5
S = √2/√5 * √5/√5
S = √10/√25
S = √10/5
S = (1/5) √10