---
title: weightedAverage
tags: math,array,beginner
---

Returns the weighted average of two or more numbers.

- Use `Array.prototype.reduce()` to add each value to an accumulator, initialized with a value of `0` and divide by the `length` of the array.

```js
const weightedAverage = (nums, weights) => 
  nums.reduce((acc, n, i) => acc + (weights[i] * n), 0) / nums.length;
```

```js
weightedAverage([1, 2, 3], [0.6,0.2,0.3]); // 0.6333
```