Weighted_Mean

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Given a set of data, X={x₁, x₂, ..., x_n} and corresponding weights, W={w₁, w₂, ..., w_n} the weighted mean is calculated as

*mean = ( w₁x₁ + w₂x₂ + ... + w_nx_n ) / ( w₁ + w₂ + ... + w_n )

Dick Beldin