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Update weighted_average.md

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Isabelle Viktoria Maciohsek
2020-10-09 09:12:38 +03:00
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--- ---
title: weighted_average title: weighted_average
tags: list,intermediate tags: math,list,intermediate
--- ---
Returns the weighted average of two or more noumbers. 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 `sum()` to sum the products of the numbers by their weight and to sum the weights.
- Use `for i in range(len(nums))` to move over every number in the two lists. - Use `zip()` and a list comprehension to iterate over the pairs of values and weights.
```py ```py
def weightedAverage(nums,weights): def weighted_average(nums, weights):
return sum(nums[i] * weights[i] for i in range(len(nums))) / sum(weights) return sum(x * y for x, y in zip(nums, weights)) / sum(weights)
``` ```
```py ```py
weightedAverage([1, 2, 3], [0.6,0.2,0.3]) # 1.727272727272727 weighted_average([1, 2, 3], [0.6,0.2,0.3]) # 1.72727
``` ```