Which formula is used to calculate the weighted mean?
- A$W.M. = \frac{\Sigma x_i}{\Sigma w_i}$
- B$W.M. = \frac{\Sigma w_i}{\Sigma x_i}$
- C$W.M. = \frac{\Sigma w_i x_i}{\Sigma x_i}$
- D$W.M. = \frac{\Sigma w_i x_i}{\Sigma w_i}$
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