Jawab:

Penjelasan dengan langkah-langkah:

Rata-rata = (9 + 8 + (7 × 2) + (6 × 3) + (5 × 2) + 4)/10

Rata-rata = (9 + 8 + 14 + 18 + 10+ 4)/10

Rata-rata = 63/10

Rata-rata = 6.3

s² = {(9 - 6.3)² + (8 - 6.3)² + 2(7 - 6.3)² + 3(6 - 6.3)² + 2(5 - 6.3)² + (4 - 6.3)²}/10

s² = {(2.7)² + (1.7)² + 2(0.7)² + 3(0.3)² + 2(-1.3)² + (-2.3)²}/10

s² = {7.29 + 2.89 + 2(0.49) + 3(0.09) + 2(1.69) + 5.29}/10

s² = 20.1/10

s² = 2.01

s = V2.01

s = 1.418

V = akar kuadrat

Jadi, simpangan baku dari data 7,8,9,7,5,6,4,6,5,6 adalah​ 1.418.