Use the transform convention $X(f)=\int x(t)e^{-j2\pi ft}\,dt$. Since $x(t)=\operatorname{sinc}(4t)$, its transform is $X(f)=\tfrac14\operatorname{rect}(f/4)$.
The rectangle has width 4 Hz and squared height 1/16. Parseval therefore gives $E=\int|X(f)|^2df=4/16=$ **0.25**.
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