The next two questions deal with an experiment. An unknown metal ‘X’ is found to react…

The next two questions deal with an experiment. An unknown metal ‘X’ is found to react spontaneously with 1.0M solution of CuSO₄ plating out Cu(s). X does not react with a solution of 1.0M Zn(NO₃)₂. The half-reactions for these metals are:
\(\mathrm{X}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \longrightarrow \mathrm{X}(\mathrm{~s})\) 
\(\mathrm{Cu}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \longrightarrow \mathrm{Cu}\) 
\(\mathrm{Zn}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \longrightarrow \mathrm{Zn}\) 
 
What is the correct order for listing the metals according to decreasing strength as reducing agent ?