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E.M.F. diagram of some ions is given as ...

E.M.F. diagram of some ions is given as `FeO_(4)^(2-)overset(E^(@)=+2.20V)rarr Fe^(3+)overset(E^(@)=+0.77V)rarr Fe^(2+) overset(E^(@)=-0.445V)rarr Fe^(@)`
Determine the value of `E_(FeO_(4)^(2-)//Fe^(2+))^(@)`

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The correct Answer is:
1.84v
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