Bac Série A Côte d'Ivoire

Practice session

A two-variable statistical series $(X, Y)$ yields the following summary values: mean of $X$: $\bar{x} = 5$, mean of $Y$: $\bar{y} = 14$, variance of $X$: $V(X) = 4$, and covariance: $\operatorname{Cov}(X, Y) = 6$. What is the equation of the linear regression line of $Y$ on $X$ ($y = ax + b$) using the method of least squares?

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