Question

Simpangan baku dari data 2,5,4,3,7,6,8,9,1 adalah ?

Answer 1

Rata-rata = 2 + 5 + 4 + 3 + 7 + 6 + 8 + 9 +1 =45/9 =5.
S² =1/9((2-5)²+(5-5)²+(4-5)²+(3-5)²+(7-5)²+(6-5)²+(8-5)²+(9-5)²+(1-5)²)
S² = 1/9(9+0+1+4+4+1+9+16+16) = 1/9(60)
S = √60/9=2√15/3