Answer :
Given
[tex]\frac{a+4}{2}<6.2[/tex]Solution
[tex]\begin{gathered} \frac{a+4}{2}<\frac{6.2}{1} \\ \\ \text{cross multiply} \\ a+4<2\times6.2 \\ a+4<12.4 \\ subtract\text{ 4 from both sides} \\ a+4-4<12.4-4 \\ a<8.4 \end{gathered}[/tex]The final answer is
[tex]a<8.4[/tex]Option D