Em tham khảo nha:
\(\begin{array}{l}
\% {Y_1} = \dfrac{1}{{1 + 3}} \times 100\% = 25\% \\
\% {Y_2} = 100 - 25 = 75\% \\
\overline {{M_Y}} = 35,5 \Leftrightarrow {M_{{Y_1}}} \times 25\% + {M_{{Y_2}}} \times 75\% = 35,5\\
\Rightarrow ({M_{{Y_2}}} + 2) \times 25\% + {M_{{Y_2}}} \times 75\% = 35,5\\
\Rightarrow {M_{{Y_2}}} = 35 \Rightarrow {M_{{Y_1}}} = 35 + 2 = 37
\end{array}\)
