Instruction 13 -Referring to Instruction 13

Instruction 13.2
A lecturer in industrial relations believes that an individual's wage rate at a factory (Y) depends on his performance rating (X₁) and the number of economics courses the employee successfully completed at university (X₂) . The lecturer randomly selects six workers and collects the following information:
$$\begin{array} { | l | l | l | l | } \hline \text { Employee } & Y ( \$ ) & X 1 & X 2 \\\hline 1 & 10 & 3 & 0 \\\hline 2 & 12 & 1 & 5 \\\hline 3 & 15 & 8 & 1 \\\hline 4 & 17 & 5 & 8 \\\hline 5 & 20 & 7 & 12 \\\hline 6 & 25 & 10 & 9 \\\hline\end{array}$$
-Referring to Instruction 13.2,for these data,what is the estimated coefficient for performance rating,b₁?

A) 9.103
B) 0.616
C) 6.932
D) 1.054