simpangan baku dari data: 6, 7, 8, 6, 8 adalah

Dik:
x = (6 + 7 + 8 + 6 + 8)/5 = 35/5 = 7

Dit:
S = ................. ?

Jwb:
S² = ((6 - 7)² + (7 - 7)² + (8 - 7)² + (6 - 7)² + (8 - 7)²)/5
S² = (1² + 0² + 1² + 1² + 1²)/5
S² = (1 + 0 + 1 + 1 + 1)/5
S² = 4/5
S² = 0,8

S = √S²
S = √0,8
S = 0,894