Resposta:
média=(3+5+x+(11-x)+8+9)/6 =36/6=6
DP²=((3-6)²+(5-6)²+(x-6)²+(11-x-6)²+(8-6)²+(9-6)²)/6
DP²=(9+1+x²-12x+36+25-10x+x²+4+9)/6
DP²=(2x²-2x+84)/6=2²
(x²-22x+42)/6=2
x²-11x+30=0
x'=[11+√(121-120)]/2=(11+1)/2=6
x''=[11-√(121-120)]/2=(11-1)/2=5
Se x=6 ==> 3, 5, 6, 5, 8, 9==>3,5,5,6,8,9
==>moda=5 e mediana=(5+6)/2=5,5
Se x=5 ==> 3, 5, 5, 6, 8, 9
(5,5-5)=0,5 ==>Letra B
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Resposta:
média=(3+5+x+(11-x)+8+9)/6 =36/6=6
DP²=((3-6)²+(5-6)²+(x-6)²+(11-x-6)²+(8-6)²+(9-6)²)/6
DP²=(9+1+x²-12x+36+25-10x+x²+4+9)/6
DP²=(2x²-2x+84)/6=2²
(x²-22x+42)/6=2
x²-11x+30=0
x'=[11+√(121-120)]/2=(11+1)/2=6
x''=[11-√(121-120)]/2=(11-1)/2=5
Se x=6 ==> 3, 5, 6, 5, 8, 9==>3,5,5,6,8,9
==>moda=5 e mediana=(5+6)/2=5,5
Se x=5 ==> 3, 5, 5, 6, 8, 9
==>moda=5 e mediana=(5+6)/2=5,5
(5,5-5)=0,5 ==>Letra B