Simpangan baku dari data : 8,6,5,7,9 adalah...

jawab

xi = 8, 6 , 5 , 7 , 9
n = 5
∑xi = 35
X= 35.5= 7

s² = [ (8-7)² +(6-7)² +(5-7)² +(7-7)² + (9-7)²] /(5)
s² = (1 + 1 + 4 + 0+ 4) /(5) = 10/5 = 2

simpangan baku = s = √s² = √2