Function averageWeighted

Computes an average of an array with a set of weights applied.

Weights can be provided as an array, expected to be on 0..1 scale, with indexes matched up to input data. Ie. data at index 2 will be weighed by index 2 in the weightings array.

// All items weighted evenly
averageWeighted([1,2,3], [1,1,1]); // 2

// First item has full weight, second half, third quarter
averageWeighted([1,2,3], [1, 0.5, 0.25]); // 1.57

// With reversed weighting of [0.25,0.5,1] value is 2.42
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A function can alternatively be provided to compute the weighting based on array index, via weight.

averageWeighted[1,2,3], Random.gaussian()); // 2.0
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This is the same as:

const data = [1,2,3];
const w = weight(data, Random.gaussian());
const avg = averageWeighted(data, w); // 2.0
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