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30-seconds-of-code/snippets/weighted_average.md
2020-10-08 23:00:33 -05:00

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---
title: weighted_average
tags: list,intermediate
---
Returns the weighted average of two or more noumbers.
- Use `sum` to sum the products of the numbers by it's weight and to sum the weights.
- Use `for i in range(len(nums))` to move over every number in the two lists.
```py
def weightedAverage(nums,weights):
return sum(nums[i] * weights[i] for i in range(len(nums))) / sum(weights)
```
```py
weightedAverage([1, 2, 3], [0.6,0.2,0.3]) # 1.727272727272727
```