A galvanic cell is constructed using two half-cells based on the two half-reactions represented below.

$$ \ce{Zn^{2+}(aq) + 2e^- -> Zn(s)} \hskip{2em} E^\circ = \pu{-0.76 V}$$ $$ \ce{Fe^{3+}(aq) + e^- -> Fe^{2+}(aq)} \hskip{2em} E^\circ = \pu{0.77 V}$$

What is the standard cell potential for the galvanic cell?