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$∴\overline x= \dfrac {ΣA_i X_i}{ΣA_i }= \dfrac { 160.294}{39.164}=4.093 cm \\ ∴\overline y= \dfrac {ΣA_i Y_i}{ΣA_i }= \dfrac {181.327}{39.164 }=4.63cm $