Description: Calculates the weighted mean of the numbers.
When the weights are all 1 (or otherwise equal) the weighted mean is
equal to the unweighted average. The weighted mean is the sum over i of
Numbers(i) * Weights(i) devided by the sum of all the weights.
The weights cannot 0 or negative.
Numbers: Cell range where the numbers are stored. Weights: Cell
range where the weights are stored.
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