curprev11:0211:02, 31 January 2023 Jfriotalkcontribs 44,678 bytes+4 →Reliability weights: There was a square missing in the weigted sum: the variance of a linear combination of random variables is the linear combination of the variances *with factors squared*. In this case, each factor is w_i / Sum{w_i} = w_i / V_1, so the factors for the variance are w_i^2 / V_1^2.undoTag: Reverted