- Choice J$$Mean \ of \ the \ first \ 4 \ projects = \frac{70+75+85+94}{4}=81 \\$$ $$ Mean \ of \ the \ 5 \ projects = \frac{70+75+85+94+x}{5}\geq 81+2=83 \\ $$ $$\Rightarrow x \geq 91$$
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- Choice J$$Mean \ of \ the \ first \ 4 \ projects = \frac{70+75+85+94}{4}=81 \\$$ $$ Mean \ of \ the \ 5 \ projects = \frac{70+75+85+94+x}{5}\geq 81+2=83 \\ $$ $$\Rightarrow x \geq 91$$
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