Calculates a weighted average from values and their corresponding weights.
The weighted average calculator gives each value a weight reflecting its importance, so more significant values contribute more to the final average.
Weighted average = Σ(value_i × weight_i) / Σ(weight_i)
Exam scores: mid-term 70 (weight 30%), project 85 (weight 30%), final 78 (weight 40%). WA = (70×30 + 85×30 + 78×40) / (30+30+40) = (2100 + 2550 + 3120) / 100 = 77.7.
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