[tex]\begin{gathered} \Sigma x=35 \\ \Sigma y=210 \\ \mu_x=7 \\ \mu_y=42 \\ SSx=\Sigma(x-\mu)^2=126 \\ SP=\Sigma(y-\mu)^(x-\mu)=-288 \end{gathered}[/tex]
So:
[tex]\begin{gathered} b=\frac{SP}{SSx}=-\frac{288}{126}=-2.28571 \\ m=\mu_y-b\mu_x=42-(-2.28571\cdot7)=58 \\ y=mx+b \\ y=-2.28571x+58 \end{gathered}[/tex]
Answer:
A
