Question
If for 5 observations of pairs $(x,y)$, $\Sigma x = 15$, $\Sigma y = 25$, $\Sigma y^2 = 135$, and $\Sigma xy = 83$, then the value of $b_{xy}$ is
If for 5 observations of pairs $(x,y)$, $\Sigma x = 15$, $\Sigma y = 25$, $\Sigma y^2 = 135$, and $\Sigma xy = 83$, then the value of $b_{xy}$ is