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python/snippets/weighted-average.md

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+---
+title: Weighted average
+type: snippet
+tags: [math,list]
+cover: digital-nomad-4
+dateModified: 2020-12-24T15:00:53+02:00
+---
+
+Returns the weighted average of two or more numbers.
+
+- Use `sum()` to sum the products of the numbers by their weight and to sum the weights.
+- Use `zip()` and a list comprehension to iterate over the pairs of values and weights.
+
+```py
+def weighted_average(nums, weights):
+  return sum(x * y for x, y in zip(nums, weights)) / sum(weights)
+```
+
+```py
+weighted_average([1, 2, 3], [0.6, 0.2, 0.3]) # 1.72727
+```