Jawaban:

Statistika

Mencari nilai rata - rata data:

Banyak data (n) = 8

X = (x1 + x2 + x3 + x4 + x5 + x6 + x7 + x8)

X = (8+6+7+6+5+8+9+7)/8

X = 56/8 = 7

.

Menentukan simpangan Baku:

SB² = 1/n { (x1 - X)² + (x2 - X)² + ... + (x8 - X)² }

SB² = 1/8 { (8 - 7)² + (6 - 7)² + ( 7 - 7)² + (6 - 7)² + (5 - 7)² + (8 - 7)² + (9 - 7)² + (7 - 7)² }

SB² = 1/8 ( 1² + (-1)² + 0² + (-1)² + (-2)² + 1² + 2² + 0²)

SB² = 1/8 (1 + 1 + 0 + 1 + 4 + 1 + 4 + 0)

SB² = 1/8 (12)

SB² = 12/8

SB = √(12/8)

SB = √(3/2)