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A weighted average assigns different importance to different values before averaging. Used when some observations should count more than others — such as course grades with different credit hours.

Trinn-for-trinn guide

1. 1WA = Σ(wᵢ × xᵢ) / Σwᵢ
2. 2Weights need not sum to 1
3. 3Equal weights → ordinary arithmetic mean

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