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The weighted binomial sum $f_m(r)=2^{-r}\sum_{i=0}^r\binom{m}{i}$ arises in coding theory and information theory. We prove that, for $m\not\in\{0,3,6,9,12\}$, the maximum value of $f_m(r)$ with $0\le r\le m$ occurs when $r=\lfloor m/3\rfloor+1$. We also show this maximum value is asymptotic to $\frac{3}{\sqrt{{\pi}m}}\left(\frac{3}{2}\right)^m$ as $m\to\infty$. 

On the Maximum of the Weighted Binomial Sum $2^{-r}\sum_{i=0}^r\binom{m}{i}$