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Update standard-deviation.md

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atomiks
2017-12-13 23:54:33 +11:00
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@ -7,7 +7,7 @@ Since there are two types of standard deviation, population and sample, you can
```js ```js
const standardDeviation = (arr, usePopulation) => { const standardDeviation = (arr, usePopulation) => {
const mean = arr.reduce((acc, val) => acc + val, 0); const mean = arr.reduce((acc, val) => acc + val, 0) / arr.length;
return Math.sqrt( return Math.sqrt(
arr.reduce((acc, val) => acc.concat(Math.pow(val - mean / arr.length, 2)), []) arr.reduce((acc, val) => acc.concat(Math.pow(val - mean / arr.length, 2)), [])
.reduce((acc, val) => acc + val, 0) .reduce((acc, val) => acc + val, 0)