\[{\text{E(}}{{\text{R}}_{\text{p}}}{\text{) = }}{{\text{R}}_{\text{f}}}{\text{ + }}\frac{{{\text{\[E(}}{{\text{R}}_{\text{m}}}{\text{) - }}{{\text{R}}_{\text{f}}}{\text{\]}}}}{{{\sigma _{\text{p}}}}}{\text{ }}{\sigma _{\text{m}}}\]
Where:
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