Symbol w_i

The passage around this formula

An aggregate benchmark score is a weighted average over items or tasks: $S = \sum_{i=1}^{n} w_i \, a_i$. where $a_i$ is accuracy, or another per-task quality measure, on task i , and $w_i$ is that task’s share of the total, with the weights summing to one. The arithmetic makes the trap explicit: S can be almost unchanged by compression even when some single $a_i$ collapses, provided $w_i$ for that task is small relative to the rest, or provided a rise elsewhere offsets the fall. A…

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